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General aviation in the United Kingdom have been defined as a civil aircraft operation other than a commercial air transport flight operating to a schedule or military aviation . Although the International Civil Aviation Organization ( ICAO ) exclude any form of remunerated aviation from its definition , some commercial operations are often included within the scope of general aviation ( GA ) in the UK . The sector operate business jets , rotorcraft , piston and jet @-@ engined fixed @-@ wing aircraft , gliders of all descriptions , and lighter than air craft . Public transport operations include business ( or corporate ) aviation and air taxi services , and account for nearly half of the economic contribution made by the sector . Other commercial GA activities are aerial work , such as surveying and air ambulances , and flight training , which play an important role in the supply of pilots to the commercial air transport ( CAT ) industry . Private flying is conducted for personal transport and recreation . It include a strong vintage aircraft movement , and encompass a range of air sports , such as racing , aerobatics , and parachuting , at which British teams and individuals have succeeded in international competition .

Of the 21 @,@ 000 civil aircraft registered in the UK , 96 per cent are engaged in GA operations , and annually the GA fleet account for between 1 @.@ 25 and 1 @.@ 35 million hours flown . The single most common class of aircraft is the fixed @-@ wing light aircraft associated with traditional GA , but the main area of growth over the last 20 years have been in the use of more affordable aircraft , such as microlights , amateur built aeroplanes , and smaller helicopters . There are 28 @,@ 000 Private Pilot Licence holders , and 10 @,@ 000 certified glider pilots . Some of the 19 @,@ 000 pilots who hold professional licences are also engaged in GA activities . Although GA operate from more than 1 @,@ 800 aerodromes and landing sites , ranging in size from large regional airports to farm strips , over 80 per cent of GA activity is conducted at 134 of the larger aerodromes . The GA industry , which is around 7 per cent the size of its CAT cousin , employ 12 @,@ 000 people , and contribute £ 1 @.@ 4 billion to the UK economy .

GA is regulated by the Civil Aviation Authority ( CAA ) , although regulatory powers are being increasingly transferred to the European Aviation Safety Agency ( EASA ) . The main focus is on standards of airworthiness and pilot licensing , and the objective is to promote high standards of safety . At the lighter end of the GA spectrum some regulatory authority is devolved to representative bodies , and gliding is in transition from a self @-@ regulatory model to more formal governance by EASA . Airspace regulation necessary to protect an increasing number of CAT operations have reduced the area in which GA flights can be freely conducted . The growth in CAT is also making access to larger airports more difficult for the GA sector , and smaller aerodromes are vulnerable to closure and re @-@ development for more profitable uses . The UK planning system have no remit to consider the national significance of GA public transport operations , and generally do not favour the development of smaller aerodromes catering to the GA market . The planning process have become a mechanism for addressing local aerodrome @-@ related environmental issues which , particularly regarding noise , are the main subjects of public criticism leveled at GA .

The International Civil Aviation Organization ( ICAO ) define general aviation ( GA ) as " an aircraft operation other than a commercial air transport operation or an aerial work operation . " It define commercial air transport ( CAT ) as " an aircraft operation involving the transport of passengers , cargo or mail for remuneration or hire " , and aerial work as " an aircraft operation in which an aircraft is used for specialized services such as agriculture , construction , photography , surveying , observation and patrol , search and rescue , aerial advertisement , etc . "

Organisations in the United Kingdom ( UK ) describe GA in less restrictive terms that include elements of commercial aviation . The British Business and General Aviation Association interpret it to be " all aeroplane and helicopter flying except that performed by the major airlines and the Armed Services " . The General Aviation Awareness Council apply the description " all Civil Aviation operations other than scheduled air services and non @-@ scheduled air transport operations for remuneration or hire " . For the purposes of a strategic review of GA in the UK , the Civil Aviation Authority ( CAA ) defined the scope of GA as " a civil aircraft operation other than a commercial air transport flight operating to a schedule " , and considered it necessary to depart from the ICAO definition and include aerial work and minor CAT operations .

The first aerodrome in the UK was established by the Aero Club at Muswell Manor on the Isle of Sheppey , and in May 1909 it was the venue of the first flight conducted in the country by a British pilot , John Moore @-@ Brabazon . In 1910 the Aero Club was granted the Royal prefix , took responsibility for controlling all private flying in the UK , and started issuing the first British pilot licences . The introduction of the de Havilland DH.60 Moth in 1925 revolutionised light aviation , and the Royal Aero Club , recognising the " vital necessity of promoting civil flying " , formed the Light Aeroplane Club scheme . Between 1925 and 1939 around 60 flying clubs was started , and more than 5 @,@ 000 pilots was trained .

During World War II civil aerodromes was taken over for military use , existing military airfields was expanded , and new ones was built . This resulted in a significant inventory of facilities becoming available after the war . Pre @-@ war civil aerodromes , for example Sywell , was returned to civilian use . Surplus military airfields was closed , and in some cases , for example Beccles , subsequently red @-@ opened as civil aerodromes . The Ministry of Civil Aviation was created to regulate all civil aviation in the UK , and this task remained the responsibility of government departments until the establishment of the independent CAA in 1972 .

The GA sector operate a range of aircraft , including balloons and airships , gliders , hang gliders , paragliders , microlights , gyrocopters , helicopters , amateur built and mass @-@ produced light aircraft , ex @-@ military aircraft , and business jets . Flights can be broadly categorised as public transport , aerial work , and private flying , the first two of which are commercial activities .

Commercial operations are remunerated activities which fall within the ICAO definition of CAT . Some are , however , closely aligned to , and considered part of , the GA sector . Public transport operations are non @-@ scheduled , on @-@ demand services flying between points specified by the customer , providing a more flexible service than airline travel . Air taxi operations offer charter services for third parties , and business or corporate aviation use company @-@ owned aircraft to transport employees and clients . Aircraft used in these operations include business jets , helicopters , and twin piston @-@ engine aeroplanes carrying between six and ten people . An example of this type of operation is the transport by helicopter of spectators to the British Formula One grand prix at Silverstone . This involve so many flights that , according to Cranfield Aviation Services , on race day the heliport is temporarily the world 's busiest airport . Aerial work is a small but important component of the commercial GA sector , characterised in its simplest form as remunerated non @-@ transport activities , such as surveying , crop spraying , and emergency services work ( air ambulance and police ) .

Flying schools are commercial businesses engaged in the training of pilots , both for recreational purposes and for those intending to fly professionally . They make widespread use of fixed @-@ wing light aircraft associated with traditional GA , not only for flying lessons but also as club aircraft rented out to qualified pilots for recreational flights . School @-@ owned aircraft account for a significant amount of GA activity , both in terms of hours flown and aircraft movements . The pilot training element is regarded by the GA community as a key benefit that is critical to the supply of pilots for the airline industry . It is claimed by the General Aviation Awareness Council that 60 – 70 per cent of professional pilots have self @-@ financed their flight training at GA schools , and one UK airline operator have stated that the industry must rely on 70 – 80 per cent of new pilots coming from the GA sector . The CAA estimate that between 1996 and 2006 the number of new professional pilots following the unsponsored training route rose from 48 per cent to 59 per cent . The counter argument to this claim is that pilots can be trained outside of the UK , and that the airline industry is not therefore dependent on a healthy GA sector in the UK for its supply of pilots . The CAA conclude that a severe reduction in GA would give " some merit to the argument that pilot recruitment would be threatened " , but that the data on flying hours " do not support such a gloomy outlook . " Of course , reliance on other countries for pilot training mean that the UK forgo the economic benefit of the training activity .

Private flying can be for both recreational purposes and personal transport , using aircraft that are owned individually , collectively as part of a syndicate , or rented from a flying club . A survey of pilots conducted between 2001 and 2002 indicated that the most common purposes of recreational flights was local flights near the base aerodrome , visits to other aerodromes , and day trip away . Half of all flights landed at the same aerodrome they departed from , and only 9 per cent involved an overnight stay away from home .

Private flying is most associated with the traditional form of factory @-@ produced two and four @-@ seater , single piston @-@ engine training and touring aircraft . Examples of these are the Cessna 152 , Cessna 172 , and Piper PA28 Cherokee , all with their origins in the 1950s , and the more modern designs of Cirrus . The average cost per hour to fly such aircraft have been estimated to be £ 133 , compared to an estimated £ 77 per hour for gliders , and a reported £ 35 per hour for microlights . Recent trends have seen an increase in the use of microlights , and also in recreational helicopter flying following the introduction of smaller and cheaper machines such as the Robinson R22 and R44 . Another growth area in private flying in recent years have been in the use of amateur built aircraft , such as the Van 's Aircraft RV @-@ 4 and the Europa .

Competitive gliding in the UK take place between May and September . Regionals are local competitions , organised and run by one of the bigger gliding clubs in the region , and represent the entry level to glider racing . Races are handicapped according to glider performance , and normally take place over nine days . Success in the regionals allow pilots to progress to the nationals , where there are five classes of competition . These are based on glider performance , the lowest being club class , and then progressing through standard ( maximum 15 metres ( 49 ft ) wingspan , and flaps not permitted ) , 15 metres ( 49 ft ) ( as standard , but flaps are permitted ) , 18 metres ( 59 ft ) ( maximum 18 metres ( 59 ft ) wingspan ) , and finally open @-@ class ( no restrictions ) . Success at national level can lead to a place in the national team and competition at international level . In 2007 the British gliding team was ranked number one , and British pilots took two women 's world championships and the open class European championship .

Handicapped air racing is open to any propeller @-@ driven aircraft capable of maintaining a minimum speed of 100 miles ( 160 km ) per hour in level flight . Races are a case of " fly low , fly fast , turn left " , consisting of 4 – 5 laps round a 20 – 25 mile ( 32 – 40 km ) circuit . Faster aircraft are handicapped by starting after slower aircraft , the intention being that the race conclude with all aircraft diving for the finish line together . There are up to 16 races per year , conducted at airfields in the UK , France and the Channel Islands , for prizes that include the Schneider Trophy and King 's Cup , and the season culminate with the British Air Racing and European Air Racing Championships .

Aerobatic competitions take place for both powered aircraft and gliders , with up to 30 events each year in the UK and Ireland . Starting at the Beginner level , pilots can move up to Standard ( powered aircraft ) or Sports ( glider ) levels , and then on to Intermediate , Advanced , and finally Unlimited classes . Each step up require a wider repertoire of aerobatic figures and progressively more performance from the aircraft . National championships are awarded annually at Standard / Sports , Intermediate , Advanced ( powered aircraft only ) , and Unlimited levels , and pilots who have reached Advanced and Unlimited levels are eligible for selection to represent the UK in international competition .

Aerodrome is a collective term for any location from which flying operations take place , although more specific terminology can be used to characterise its purpose . The CAA strategic review of GA apply the term airport to locations which predominantly support large scale commercial operations , and airfield to locations which predominantly support GA operations . The General Aviation Small Aerodrome Research Study ( GASAR ) analysed 687 aerodromes in England which come under the scope of GA , classifying 374 into six types . These range in size from regional airports to the smallest farm strip , although 84 per cent of GA flights operate from 134 of the larger aerodromes in the first four categories .

The factors used in determining how an individual aerodrome is categorised by the GASAR study are based broadly on size and facilities . The six types of aerodrome are described , in size order , as : regional airports ( e.g. East Midlands ) ; major GA airports ( e.g. Oxford ) ; developed GA airfields ( e.g. Andrewsfield ) ; basic GA airfields ( e.g. Rufforth ) ; developed airstrips ( e.g. Tilstock ) ; and basic airstrips ( e.g. Chilbolton in Hampshire ) . The actual criteria used to categorise aerodromes was complex , using 28 different parameters , backed up with a peer review by experienced GA pilots .

Airports generally have long , fully lit , hard @-@ surfaced runways , full air traffic control , and navigation and landing aids . They are usually located on urban fringes , support commercial and business operations , and often exclude certain types of light aircraft . At the more rurally located airfields , the lighter end of aviation , such as microlight and gliding activities , become increasingly prevalent , and there are few or no commercial operations other than flying schools . At this level runways are generally shorter , and grass surfaces are increasingly common . Navigation aids are increasingly scarce , being more basic where they are available , and informal ground to air radio communication replace air traffic control . The smallest airfields are too small to feature on general purpose Ordnance Survey ( OS ) maps , and lack basic facilities such as fuel and maintenance . The majority of airstrips are basically single short grass runways with no supporting facilities , although the presence of a hangar is not uncommon at the larger examples . They do not feature on OS maps , and are owned by private clubs or , more commonly , individuals .

The number of aerodromes that support GA in the UK is difficult to establish with certainty . Pooleys 2008 United Kingdom Flight Guide list 355 , and the Airplan Flight Equipment UK VFR Flight Guide 2008 list nearly 500 . Lockyears Farm ' Strips ' and Private Airfields Flight Guide list more than 300 landing sites . The GASAR study estimate 1 @,@ 100 formal flying sites in England alone , a figure which include 400 sites known to planning authorities but not included in flight guides . It estimate another 759 informal sites known only to land owners , customs , and members of the enthusiast group Air @-@ Britain .

Most sectors of GA for which data are available have experienced growth in aircraft numbers and hours flown over the last two decades . The lighter end of the GA spectrum : microlights , amateur built , and airships and balloons , have in particular shown strong growth , although the last of these activities was severely curtailed during the foot @-@ and @-@ mouth outbreak in 2001 , when access to farmland was denied . After strong growth in the late 1980s , traditional flying have shown a slight decline recently , reflecting a move amongst recreational flyers towards microlight aircraft , and increased numbers of foreign @-@ registered aircraft . Recreational helicopter usage have grown primarily due to the introduction of smaller and cheaper aircraft . Glider activity have remained relatively static , although there have been a gradual increase in the number of self @-@ launching motor gliders .

Business aviation have shown strong growth , although the numbers of aircraft on the UK register have declined . This reflect a shift away from turboprop aircraft towards foreign @-@ registered business jets based in the UK , which are estimated to be growing in numbers . However , twin piston @-@ engined aircraft numbers have declined significantly , reflecting pressures on the light air @-@ taxi segment from increasingly flexible and cheaper scheduled services , and a more sophisticated corporate charter business . The amount of flight training conducted by UK schools have declined , largely at the hands of competition from foreign schools , which benefit from lower costs and better weather .

Since 1990 the total number of hours flown annually by the GA sector have remained in the range 1 @.@ 25 – 1 @.@ 35 million , the dominant sector being traditional GA flying , which account for 0 @.@ 6 million per year . An overall increase in aircraft numbers combined with nil growth in hours flown have brought the annual average utilisation per aircraft down from 157 hours in 1984 to 103 hours in 2002 . The decline in asset utilisation have led to speculation that the economic health of the GA industry is weakening , though the lack of data on profitability make this difficult to confirm .

The objective of regulation is to " promote high standards of safety in all aspects of aviation " , and this is the main area of interaction between the CAA and the GA sector . Efforts focus on assuring appropriate standards of airworthiness , pilot qualification , the rules for the movement of aircraft , and equipment to be carried . The CAA was established as the primary regulatory body for all aviation in the UK in 1972 . In 1991 it started working within the Joint Aviation Authorities ( JAA ) framework to implement agreed common standards , known as the Joint Aviation Requirements ( JAR ) , throughout the European Union ( EU ) . In 2003 this was taken a step further when the European Aviation Safety Agency ( EASA ) was established as the central EU regulator , taking over responsibility for legislating airworthiness and environmental regulation from the national authorities . The CAA act as an agency of EASA on these issues , retaining its original regulatory powers in areas not yet transferred to EASA . Proposed developments seek to establish EASA as the single authority throughout the EU , taking over from individual member state the power to regulate all aviation other than that specifically excluded from the scope of EASA .

Within this framework certain sectors of GA are governed on a devolved basis . In all cases the CAA / EASA retain responsibility for safety regulation , but representative bodies , particularly of sectors that are not included in the scope of EASA , are granted greater oversight of their activities . The majority of microlight aircraft are regulated by the British Microlight Aircraft Association ( BMAA ) , although a significant number are regulated by the Light Aircraft Association ( LAA ) , formerly known as the Popular Flying Association . The LAA is the primary regulator for amateur built aircraft , as well as vintage and classic aircraft . Parachuting is governed by the British Parachute Association , although the aircraft used in this activity are generally CAA @-@ regulated . Balloon and airship flying is overseen by the British Balloon and Airship Club . The UK @-@ specific National Private Pilot Licence ( NPPL ) is administered by the National Pilots Licensing Group Ltd . , supported by the LAA , the Aircraft Owners and Pilots Association UK , the British Gliding Association , and the British Microlight Aircraft Association . Separate from these devolved groups , gliding in the UK is self @-@ regulated . The British Gliding Association was until recently responsible for glider airworthiness , now formally regulated as a result of EASA legislation , and still retain control of pilot certification . Hang gliding and paragliding activities ( i.e. foot @-@ launched gliders ) are governed by the British Hang Gliding and Paragliding Association .

Under CAA and EASA rules , all aircraft are required to meet certain standards of airworthiness to fly safely and legally . Aircraft that meet these standards are issued with a Certificate of Airworthiness . However , British @-@ registered aircraft which are excluded from the scope of EASA , and which cannot satisfy the requirements for the issue of a Certificate of Airworthiness , may be issued with a Permit to Fly . This allow them to fly in UK airspace subject to certain limitations , for example being restricted to day @-@ time flights under visual flight rules only . A number of organisations ( e.g. the British Microlight Aircraft Association and the Light Aircraft Association ) have obtained a standing over @-@ flight permission for Permit to Fly aircraft within their area of interest with some European countries , notably France . Permits are typically issued to vintage and historic aircraft , amateur built aircraft , and microlights .

The pilot qualification most relevant to GA is the Private Pilot Licence ( PPL ) , which permit the holder to fly for recreational purposes without remuneration . In addition to the European @-@ wide Joint Aviation Regulations Flight Crew Licensing ( JAR @-@ FCL ) standard , the CAA also issue UK @-@ specific national licences . In the absence of European standards for gyroplane , balloon , and airship pilots , the CAA license these according to the original UK PPL standard . As a response to the perception that JAR pilot licensing standards are excessively bureaucratic and expensive for the purposes of recreational pilots , the National Private Pilot Licence ( NPPL ) was introduced in 2002 . The NPPL is easier to obtain than the JAR @-@ FCL licence , have less stringent medical requirements , is more restrictive in the privileges it grant , and is valid only for flights in British @-@ registered aircraft flying in UK and French airspace . Although there are plans to bring glider pilot licensing within the regulatory framework of EASA , the gliding sector is currently self @-@ regulating in this respect . The British Gliding Association is responsible for defining the standards of initial training , and certifying , via a badge system , pilots who meet those standards . Pilots working in sectors of GA that are commercial operations , such as aerial work and business aviation , are required to hold a professional pilot licence which , at a minimum , is the Commercial Pilot Licence .

Between 1995 and 2004 there was 2 @,@ 630 accidents involving GA aircraft , of which 139 was fatal , resulting in the loss of 317 lives . The majority of accidents involved small fixed @-@ wing aircraft engaged in private flights , and analysis attribute the most common causes of these to : flight handling skills ; poor judgement or airmanship ; lack of training or experience ; and omission of , or inappropriate , action .

There was 27 fatal accidents involving GA aircraft in 2007 , resulting in the loss of 48 lives . These compare with 16 accidents claiming a total of 19 live the previous year , and although the 2007 statistics are higher than average , they are not exceptional .

The growth in Commercial Air Transport ( CAT ) have eroded the operational freedom of GA , both in the air and on the ground at larger airports . Difficulty with access to larger airports is compounded by a decline in the number of aerodromes generally , and existing sites are often threatened with closure and re @-@ development for more profitable uses . The UK planning system is designed to focus on local issues , and consideration of the national impact of GA operations is not within its remit . This make aerodrome development difficult , often subjecting those that successfully negotiate the process to restrictions in use .

Controlled airspace is essential for the provision of a known air traffic environment necessary for the safe operation of CAT . A CAA review found that " mixing [ commercial ] operations with other users is considered undesirable , even untenable " by commercial operators . However this position have resulted in extensive Class A controlled airspace with complex boundaries , including some running down to the ground , prohibiting VFR access to airspace , resulting in high numbers of GA flights operating close to the borders of controlled airspace who could not get formal receipt of an air traffic service . Coupled with pilot navigation errors , hundreds of airspace infringements have been recorded every year .

Increases in the number of CAT operations , and in the number of airports they operate from , have resulted in a corresponding increase in Class A controlled airspace . Between 1997 and 2006 this area grew in size from 13 per cent of all airspace to 22 per cent nationally , and from 24 per cent to 43 per cent in airspace above England and Wales , leading to a perception within the GA community of being squeezed out . There are particular problems for GA around large airports , where Class A controlled airspace extend to ground level . The concentration of commercial operations and high demand for GA in the South East of England have also resulted in extensive areas of Class A controlled airspace there , which serve to channel uncontrolled GA operations through high @-@ collision @-@ risk hot spots .

Regional airports , such as Edinburgh Airport , have experienced strong growth in CAT operations in recent years . These operations are commercially and operationally incompatible with GA , and although there is no evidence of deliberate discrimination , the effect have been to discourage or exclude it . GA aircraft are being subject to significant increases in charges , including the imposition of handling fees in some cases . Some airports restrict or deny GA parking , and others limit or refuse certain GA activity . As a result , light GA aircraft are now rarely or never seen at large , busy international airports such as Heathrow , Stansted , Gatwick and Manchester .

In addition to this de facto loss of facilities , the number of aerodromes in the UK have been in decline over the last 50 years , as a result of increasing urbanisation and the closure of airfields built during WWII . Alternative and more profitable uses for land can also lead to existing aerodromes being threatened with closure , for example North Weald , or actually being closed , as happened to Ipswich Airport. and Bristol Filton Airport . Referring to the importance of a " functioning national network of GA airfields " , especially where GA perform an air transport role , the CAA state that " there could be cause for concern if a significant further loss of airfields was to continue , especially if crucial nodes on the transport network was to be lost . "

Public opinion towards aviation generally is worsening , based on increasing environmental concerns relating to emissions and noise , and private flying have been criticised by respondents to a government consultation on aircraft noise as a frivolous or selfish activity . In terms of environmental complaints and enquiries made to the CAA that relate specifically to GA , noise is " by far " the most common subject . Half of the 2 @,@ 000 noise complaints made annually to the CAA concern GA operations , most of which relate to aerobatics , helicopters using private sites , air balloon incidents , parachute dropping , and alleged low flying .

Planning guidance on aircraft noise advise that " in some circumstances the public perceive general aircraft noise levels as more disturbing than similar levels around major airports . " This is a result of the tonal characteristics of light aircraft engines and the activities they are engaged in , including : repetitive circuit flying at low @-@ altitude near an aerodrome , during which aircraft are audible for long periods ; slow climbing aircraft engaged in parachute drop or glider tug activities concentrated around the drop zone or aerodrome , also audible for long periods ; erratic and repetitive engine noise from aircraft engaged in aerobatics ; and piston @-@ engines on full power in areas of low background noise , leading to the perception that such noise is more intrusive . In an attempt to alleviate these problems , the majority of aerodromes implement noise abatement procedures designed to route aircraft away from noise sensitive areas , and more than 50 are required by the government to provide consultative facilities in which local concerns can be raised with aerodrome operators .

SMS Zrínyi ( " His Majesty 's ship Zrínyi " ) was a Radetzky @-@ class pred @-@ dreadnought battleship ( Schlachtschiff ) of the Austro @-@ Hungarian Navy ( K.u.K. Kriegsmarine ) , named for the Zrinski , a noble Croatian family . Zrínyi and her sisters , Erzherzog Franz Ferdinand and Radetzky , was the last pre @-@ dreadnoughts built by the Austro @-@ Hungarian Navy .

Zrínyi was built at the Stabilimento Tecnico Triestino dockyard in Trieste , the same place where her sister ships was built earlier . She was laid down on 15 November 1908 and launched from the slipway on 12 April 1910 . The teak used on Zrínyi 's deck was the only material Austria @-@ Hungary had to purchase abroad to build the ship . The ship was completed by 15 July 1911 , and on 22 November 1911 she was commissioned into the fleet . She was the last ship of the class to be completed and had a crew of 880 to 890 officers and men .

The ship 's primary armament consisted of four 30 @.@ 5 cm ( 12 in ) 45 @-@ caliber guns in two twin gun turrets . This was augmented by a heavy secondary battery of eight 24 cm ( 9 @.@ 4 in ) guns in four wing turrets . The tertiary battery consisted of twenty 10 cm L / 50 guns in casemated single mounts , four 47 mm ( 1 @.@ 85 in ) L / 44 and one 47 mm L / 33 quick @-@ firing guns . Furthermore , the ship 's boats was equipped with two 66 mm ( 2 @.@ 6 in ) landing guns for operations shore . Three 45 cm ( 17 @.@ 7 in ) torpedo tubes was also carried , one on each broadside and one in the stern .

The ship was assigned to the Austro @-@ Hungarian Fleet 's 1st Battle Squadron after her 1911 commissioning . In 1912 , Zrínyi and her two sister ships conducted two training cruises into the eastern Mediterranean Sea . On the second cruise into the Aegean Sea , conducted from November to December , Zrínyi and her sister ships was accompanied by the cruiser SMS Admiral Spaun and a pair of destroyers . After returning to Pola , the entire fleet mobilized for possible hostilities , as tensions flared in the Balkans .

In 1913 , Zrínyi participated in an international naval demonstration in the Ionian Sea to protest the Balkan Wars . Ships from other navies included in the demonstration was the British pre @-@ dreadnought HMS King Edward VII , the Italian pred @-@ dreadnought Ammiraglio di Saint Bon , the French armored cruiser Edgar Quinet , and the German light cruiser SMS Breslau . The most important action of the combined flotilla , which was under the command of British Admiral Cecil Burney , was to blockade the Montenegrin coast . The goal of the blockade was to prevent Serbian reinforcements from supporting the siege at Scutari , where Montenegro had besieged a combined force of Albanians and Ottomans . Pressured by the international blockade , Serbia withdrew its army from Scutari , which was subsequently occupied by a joint Allied ground force .

During that year , the first of four new dreadnoughts , SMS Viribus Unitis , that made up the Tegetthoff class — the only dreadnoughts built for the Austro @-@ Hungarian Navy — came into active service . With the commissioning of these dreadnoughts , Zrínyi and her sisters was moved from the 1st Division to the 2nd Division of the 1st Battle Squadron .

At that time of the assassination of Archduke Franz Ferdinand of Austria on 28 June 1914 , the battleships in the Austro @-@ Hungarian Navy consisted of the Radetzky class , the Tegetthoff class ( which still had one ship , SMS Szent István , under construction ) , the Erzherzog Karl class and finally , the older Habsburg class . Along with the remainder of the Austro @-@ Hungarian Navy , Zrínyi was mobilized in late July 1914 to support the flight of SMS Goeben and SMS Breslau . The two German ships broke out of Messina , which was surrounded by the British navy and reached Turkey . The flotilla had advanced as far south as Brindisi in southeastern Italy when news of the successful breakout reached Vienna . The Austro @-@ Hungarian ships was then recalled before seeing action .

On 23 May 1915 , between two and four hours after news of the Italian declaration of war reached the main Austro @-@ Hungarian naval base at Pola , Zrínyi and the rest of the fleet departed to bombard the Italian and Montenegrin coast . Their focus was on the important naval base at Ancona , and later the coast of Montenegro . The bombardment of Montenegro was part of the larger Austro @-@ Hungarian campaign against the Kingdoms of Montenegro and Serbia , who was members of the Entente , during the first half of 1915 . The attack on Ancona was an immense success , and the ships was unopposed during the operation . The bombardment of the province and the surrounding area resulted in the destruction of an Italian steamer in the port of Ancona itself , and an Italian destroyer , Turbine , was severely damaged further south . On the shore , the infrastructure of the port of Ancona , as well as the surrounding towns , was severely damaged . The railroad yard in Ancona , as well as the port facilities in the town , was damaged or destroyed . The local shore batteries was also suppressed . During the bombardment , Zrínyi also helped to destroy a train , a railway station , and a bridge at Senigallia . Additional targets that was damaged or destroyed included wharves , warehouses , oil tanks , radio stations , and the local barracks . Sixty @-@ three Italians , both civilians and military personnel , was killed in the bombardment . By the time Italian ships from Taranto and Brindisi arrived on the scene , the Austro @-@ Hungarians was safely back in Pola .

The objective of the bombardment of Ancona was to delay the Italian Army from deploying its forces along the border with Austria @-@ Hungary by destroying critical transportation systems . The surprise attack on Ancona succeeded in delaying the Italian deployment to the Alps for two weeks . This delay gave Austria @-@ Hungary valuable time to strengthen its Italian border and red @-@ deploy some of its troops from the Eastern and Balkan fronts .

Aside from the attack on Ancona , the Austro @-@ Hungarian battleships was largely confined to Pola for the duration of the war . Their operations was limited by Admiral Anton Haus , the commander of the Austro @-@ Hungarian Navy , who believed that he would need to husband his ships to counter any Italian attempt to seize the Dalmatian coast . Since coal was diverted to the newer Tegetthoff @-@ class battleships , the remainder of the war saw Zrínyi and the rest of the Austro @-@ Hungarian Navy acting as a fleet in being . This resulted in the Allied blockade of the Otranto Strait . With his fleet blockaded in the Adriatic Sea , and with a shortage of coal , Haus followed a strategy based on mines and submarines designed to reduce the numerical superiority of the Allied navies .

After the Austro @-@ Hungarian Empire collapsed in 1918 , the Austrians wanted to turn the fleet over to the newly created State of Slovenes , Croats and Serbs ( later to become a part of the Kingdom of Yugoslavia ) in order to prevent the Italians from claiming the ships as spoils of war . However , the victorious Allies refused to acknowledge the conversations between the Austrians and the south Slavs and , in due course , reallocated the ships . The ship had been boarded by a scratch Yugoslav crew on 10 November 1918 , one day before the Armistice , and had left Pola with her sister ship , Radetzky . They was soon spotted by heavy Italian ships , so the two battleships hoisted American flags and sailed south along the Adriatic coast to Castelli Bay near Spalato ( also known as Split ) . They appealed for American naval forces to meet them and accept their surrender , which a squadron of United States Navy ( USN ) submarine chasers in the area did . She had apparently been turned over to the fledgling south Slav state , as it was a Croat naval officer , Korvettenkapitän Marijan Polić , who presented the ship as a prize of war to representatives of the United States Navy on the afternoon of 22 November 1919 at Spalato ( Split ) in Dalmatia . Simultaneously she was commissioned as USS Zrínyi and Lieutenant E.E. Hazlett , USN , assumed command . The initial American complement consisted of four officers and 174 enlisted men — the latter entirely composed of United States Navy Reserve Force personnel . The ship remained at anchor at Spalato for nearly a year while the negotiations that would determine her ultimate fate dragged on . Only once did she apparently turn her engines over , and that occurred during a severe gale that struck Spalato on 9 February 1920 .

Geopyxis carbonaria is a species of fungus in the genus Geopyxis , family Pyronemataceae . First described to science in 1805 , and given its current name in 1889 , the species is commonly known as the charcoal loving elf @-@ cup , dwarf acorn cup , stalked bonfire cup , or pixie cup . The small , goblet @-@ shaped fruitbodies of the fungus are reddish @-@ brown with a whitish fringe and measure up to 2 cm ( 0 @.@ 8 in ) across . They have a short , tapered stalk . Fruitbodies are commonly found on soil where brush have recently been burned , sometimes in great numbers . The fungus is distributed throughout many temperate regions of the Northern Hemisphere . It is found in Europe , Turkey , and North America . Although it is primarily a saprotrophic species , feeding on the decomposing organic matter remaining after a fire , it also form biotrophic associations with the roots of Norway spruce .

The fungus was first described scientifically in 1805 by Johannes Baptista von Albertini and Lewis David de Schweinitz as Peziza carbonaria . Mordecai Cubitt Cooke illustrated the fruitbodies , spores , and asci in his 1879 work Mycographia , seu Icones fungorum . Figures of fungi from all parts of the world . In 1889 , Pier Andrea Saccardo transferred the fungus to the genus Geopyxis , giving the species its current name . Pustularia carbonaria , published by Heinrich Rehm in 1884 , is a synonym of G. carbonaria . Louis @-@ Joseph Grélet proposed the variety Geopyxis carbonaria var. sessilis in 1937 , referring to forms producing fruitbodies without a stalk , but the taxon is not considered to have independent taxonomic significance . In 1860 Miles Berkeley and Moses Ashley Curtis described the species Peziza lepida from collections made in Japan as part of the North Pacific Exploring and Surveying Expedition ( 1853 – 1856 ) . This taxoned was synonymized with G. carbonaria by Mien Rifai in 1968 , a taxonomic opinion corroborated by Donald Pfister about a decade later .

The specific epithet carbonaria derive from the Latin word for " charcoal " . Common names given to the fungus include " charcoal loving elf @-@ cup " , " dwarf acorn cup " , " pixie cup " , and the British Mycological Society approved " stalked bonfire cup " .

The fruitbodies ( ascocarps ) of Geopyxis carbonaris are cup shaped , 1 – 2 cm wide , and have fringed whitish margins . The inner spore @-@ bearing surface of the cup , the hymenium , is brick red and smooth , while the exterior surface is a dull yellow , and may be either smooth or have blister @-@ like spots ( pustules ) . The stipe is small ( 1 – 1 @.@ 5 mm long and 1 – 2 mm wide ) , whitish in color , and expand abruptly into the cup . The brownish flesh of the fungus is thin and brittle . It do not have any distinctive taste , but have an unpleasant smell when crushed in water . The edibility of the fungus is not known , but the fruitbodies are insubstantial and unlikely to be harvested for eating .

The closely related vulcan elf cup ( Geopyxis vulcanalis ) have a pale orange to yellowish fruitbody that is deeply cup shaped before flattening in maturity , and its crushed flesh often have an odor of sulfur . It may be distinguished microscopically by its paraphyses , which lack the orange @-@ brown granules characteristic of G. carbonaria . It also have larger spores , measuring 14 – 22 by 8 – 11 µm . Unlike G. carbonaria , it grow on substrates other than burned wood , including mosses , and needle duff . Tarzetta cupularis , which grow habitats similar to G. carbonaria , is distinguished microscopically by its spores that contain two oil droplets . Other genera with similar species with which G. carbonaria may be confused in the field include Aleuria , Caloscypha , Melastiza , and Sowerbyella .

Geopyxis carbonaria is widespread on burned soil or charcoal in the spring and throughout the growing season . It is one of the most common pioneer species found on burned ground . The charred litter on the forest floor increase the underlying soil pH as well as the availability of minerals . Fruitbodies are produced from 16 to 139 weeks after a forest fire in areas with coniferous trees . Most fruitbodies are produced in the first year after a burn . The fungus prefer fruiting in microhabitats with thin postfire duff near standing burned tree trunks . Geopyxis carbonaria fruitbodies are often found in the same post @-@ fire stand as morels , although the former is usually more abundant . Because the pixie cup fruits earlier than morels , it may serve as an indicator of imminent morel fruiting . Other cup fungi often found fruiting in the same area as G. carbonaria include those from the genera Aleuria , Anthracobia , Peziza , and Tarzetta .

The fungus is found in Europe ( from where it was originally described ) , and is widespread throughout North America . The North American distribution extend north to Alaska . In 2010 , it was reported for the first time from Turkey .

Although primarily a saprotrophic fungus involved in the post @-@ fire breakdown of duff and coniferous roots , Geopyxis carbonaria have been shown to be capable of forming ectomycorrhizae with Norway spruce ( Picea abies ) . It had been demonstrated earlier in laboratory experiments that the fungus have a biotrophic interaction with lodgepole pine ( Pinus contorta ) . The hyphae of G. carbonaria was able to infect the cortex of the tree seedling , but did not penetrate the endodermis . These traits suggest that the fungus is a moderate pathogen , with limited ability to cause reductions in seed germination . Additionally , the fungus produce the enzyme polyphenol oxidase , and can break down the complex organic polymer lignin — feature characteristic of saprotrophic fungi . The formation of a rudimentary Hartig net , a characteristic of mycorrhizal fungi , indicated that G. carbonaria might be capable of forming mutualistic relationships under the right conditions . Vrålstad and colleagues suggest that its below @-@ ground association with spruce roots protect it from physical damage in the event of a fire , and the extensive fruitbody production after a fire may reflect " a successful fungal escape from a dying host where the fungus no longer can maintain its biotrophic association " .

Large fruitings of the fungus are often associated with damage to the host tree , such as that which occur with burning . A field study conducted in Norway demonstrated that fruit bodies was more likely to be found in areas that was heavily burned , compared to locations with light to moderate burning where the trees remained viable , or in clearcut areas . Fruiting was much denser in spruce forests — with up to 700 – 1000 fruitbodies per square meter — than in pine forests , where fruitbodies was sporadic . Fruitbodies grew by the millions in the year following the Yellowstone fires of 1988 .

A gold dollar had been proposed several times in the 1830s and 1840s , but was not initially adopted . Congress was finally galvanized into action by the increased supply of bullion caused by the California gold rush , and in 1849 authorized a gold dollar . In its early years , silver coins was being hoarded or exported , and the gold dollar found a ready place in commerce . Silver again circulated after Congress in 1853 required that new coins of that metal be made lighter , and the gold dollar became a rarity in commerce even before federal coins vanished from circulation because of the economic disruption caused by the American Civil War .

In 1831 , the first gold dollar was minted , at the private mint of Christopher Bechtler in North Carolina . Much of the gold then being produced in the United States came from the mountains of North Carolina and Georgia , and the dollars and other small gold coins issued by Bechtler circulated through that region , and was now and then seen further away . Additional one @-@ dollar pieces was struck by August Bechtler , Christopher 's son .

In January 1844 , North Carolina Representative James Iver McKay , the chairman of the Committee on Ways and Means , solicited the views of Director Patterson on the gold dollar . Patterson had more of Gobrecht 's pattern dollar struck to show to committee members , again advising against a coin that if issued would be only about a half inch ( 13 mm ) in diameter . He told Treasury Secretary John C. Spencer that the only gold coins of that size in commerce , the Spanish and Colombian half @-@ escudos , was unpopular and had not been struck for more than twenty years . This seemed to satisfy the committee as nothing more was done for the time , and when a gold dollar was proposed again in 1846 , McKay 's committee recommended against it .

Even before 1848 , record amounts of gold was flowing to American mints to be struck into coin , but the California Gold Rush vastly increased these quantities . This renewed calls for a gold dollar , as well as for a higher denomination than the eagle ( $ 10 piece ) , then the largest gold coin . In January 1849 , McKay introduced a bill for a gold dollar , which was referred to his committee . There was much discussion in the press about the proposed coin ; one newspaper published a proposal for an annular gold dollar , that is , with a hole in the middle to increase its small diameter . McKay amended his legislation to provide for a double eagle ( $ 20 gold coin ) and wrote to Patterson , who replied stating that the annular gold dollar would not work , and neither would another proposal to have dollar piece consisting of a gold plug in a silver coin . Nevertheless , Gobrecht 's successor as chief engraver , James B. Longacre , prepared patterns , including some with a square hole in the middle .

McKay got his fellow Democrat , New Hampshire Senator Charles Atherton , to introduce the bill to authorize the gold dollar and the double eagle in the Senate on February 1 , 1849 — Atherton was chairman of the Senate Finance Committee . McKay introduced a version into the House on February 20 ; debate began the same day . The dollar was attacked by congressmen from the Whig Party , then in the minority , on the grounds that it would be too small , would be counterfeited and in bad light might be mistakenly spent as a half dime , the coins being similar in size . McKay did not respond substantively , but stated that if no one wanted these denominations , they would not be called for at the Mint , and would not be coined . Pennsylvania Representative Joseph Ingersoll , a Whig , spoke against the bill , noting that Patterson opposed the new denominations , and that the idea had been repeatedly turned down , whenever considered . Another Whig , Massachusetts 's Charles Hudson , related that Patterson had sent a real and a counterfeit gold dollar to his committee and the majority of members had been unable to tell the difference . McKay made no answer to these claims , but others did , including New York Congressman Henry Nicoll , who assured the House that the counterfeiting allegations was greatly exaggerated . The point was , he indicated , that the double eagle and gold dollar was wanted by the public , and , in the case of the gold dollar could help money circulate in small communities where banknotes was not accepted . Connecticut Representative John A. Rockwell , a Whig , tried to table the bill , but his motion was defeated . The bill passed easily , and met only minimal opposition in the Senate , becoming law on March 3 , 1849 .

The officers at the Philadelphia Mint , including Chief Coiner Franklin Peale , was mostly the friends and relations of Director Patterson . The outsider in their midst was Chief Engraver James B. Longacre , successor to Gobrecht ( who had died in 1844 ) . A former copper @-@ plate engraver , Longacre had been appointed through the political influence of South Carolina Senator John C. Calhoun .

When Longacre began work on the two new coins in early 1849 , he had no one to assist him . Longacre wrote the following year that he had been warned by a Mint employee that one of the officers ( undoubtedly Peale ) planned to undermine the chief engraver 's position by having the work of preparing designs and die done outside Mint premises . Accordingly , when the gold coin bill became law , Longacre apprised Patterson that he was ready to begin work on the gold dollar . The Mint Director agreed , and after viewing a model of the head on the obverse , authorized Longacre to proceed with preparation of dies . According to Longacre ,

The engraving was unusually minute and required very close and incessant labor for several weeks . I made the original dies and hubs for making the working die twice over , to secure their perfect adaptation to the coining machinery . I had a wish to execute this work single handed , that I might thus silently reply to those who had questioned my ability for the work . The result , I believe , was satisfactory .

The Type 1 gold dollar depict a head of Liberty , facing left , with a coronet or tiara on her head bearing her name . Her hair is gathered in a bun ; she is surrounded by 13 stars representing the original states . The reverse feature the date and denomination within a wreath , with the name of the nation near the rim .

Contemporary reviews of the Type 1 design was generally favorable . The New York Weekly Tribune on May 19 , 1849 described the new dollar as " undoubtedly the neatest , tiniest , lightest , coin in this country ... it is too delicate and beautiful to pay out for potatoes , and sauerkraut , and salt pork . Oberon might have paid Puck with it for bringing the blossom which bewitched Titania . " Willis ' Bank Note List stated that " there is no probability of them ever getting into general circulation ; they are altogether too small . " The North Carolina Standard hoped that they would be struck at the Charlotte Mint and circulated locally to eliminate the problem of small @-@ denomination bank notes from out of state . Coin dealer and numismatic author Q. David Bowers note that the head of Liberty on the Type 1 dollar is a scaled @-@ down version of that on the double eagle , and " a nicely preserved gold dollar is beautiful to behold " .

Mint records indicate the first gold dollars was produced on May 7 , 1849 ; Longacre 's diary notes state instead that the first was struck on May 8 . A few coins in proof condition was struck on the first day , along with about 1 @,@ 000 for circulation . There are five major varieties of the 1849 gold dollar from Philadelphia , made as Longacre continued to fine @-@ tune the design . Mintmarked dies was sent by Longacre 's Engraving Department at the Philadelphia Mint to the branch mints at Charlotte , Dahlonega ( in Georgia ) , and New Orleans ; coins struck at the branches resemble some of the types issued from Philadelphia , depending on when the dies was produced . Of the coins struck at the branch mints in 1849 , only pieces struck at Charlotte ( 1849 @-@ C ) exist in multiple varieties ; most are of what is dubbed the " Closed Wreath " variety . Approximately five of the 1849 @-@ C Open Wreath are known ; one , believed the finest surviving specimen , sold at auction for $ 690 @,@ 000 in 2004 , remaining a record for the gold dollar series as of 2013 . One of the changes made during production was the inclusion of Longacre 's initial " L " on the truncation of Liberty 's neck , the first time a U.S. coin intended for full @-@ scale production had borne the initial of its designer . All issues beginning in 1850 bear the Closed Wreath . Beginning in 1854 , the gold dollar was also struck at the new San Francisco Mint .

The continued flow of gold from California made silver expensive in terms of gold , and U.S. silver coins began to flow out of the country for melting in 1849 , a flow that accelerated over the next several years as the price of the metal continued to rise . By 1853 , a thousand dollars in silver coin contained $ 1 @,@ 042 worth of bullion . As silver coins vanished , the gold dollar became the only federal coin in circulation between the cent and the quarter eagle ( $ 2 @.@ 50 piece ) . As such , it was struck in large numbers and widely circulated . According to Bowers in his book on the denomination , " the years 1850 to 1853 was the high @-@ water mark of the gold dollar , the glory years of the denomination when the little gold coins took the place of half dollars and silver dollars in everyday transactions . " This time came to an end in 1853 when Congress passed an act reducing the weight of most silver coins , allowing new issues of them to circulate .

As early as 1851 , New York Congressman William Duer alleged that that Patterson had made the gold dollar too small in diameter on purpose to provoke criticism . Patterson retired that year after 16 years in his position , and under his successor , George N. Eckert , annular gold dollar and half dollar patterns was struck . Public Ledger reported that although gold dollars would not be struck in annular form , gold half dollars would be , to help fill the need for change . With the new Pierce administration , Thomas M. Pettit took office as Mint Director on March 31 , 1853 . In April , Treasury Secretary James Guthrie wrote to Pettit that there was complaints that the gold dollar was too small , often lost or mistaken for a small silver coin , and enquiring about reports the Mint had experimented with annular dollars . Pettit replied , stating that none had been preserved , but enclosed a silver piece of equivalent size . He noted that while there would be technical difficulties in the production of the annular dollar , these could be overcome . In a letter dated May 10 , Pettit proposed an oval @-@ shaped holed piece , or an angular @-@ shaped coin , which would lessen the production problems . Pettit died suddenly on May 31 ; Guthrie did not let the issue fall , but queried Pettit 's replacement , James Ross Snowden , concerning the issue on June 7 . As U.S. coins was required to bear some device emblematic of liberty , the secretary hoped that artists could be found who could find some such design for an annular coin .

The Act of February 21 , 1853 , that had lightened the silver coins also authorized a gold three @-@ dollar piece , which began to be produced in 1854 . To ensure that the three @-@ dollar piece was not mistaken for other gold coins , it had been made thinner and wider than it would normally be , and Longacre put a distinctive design with an Indian princess on it . Longacre adapted both the technique and the design for the gold dollar , which was made thinner , and thus wider . An adaptation of Longacre 's princess for the larger gold coin was placed on the dollar , and a similar agricultural wreath on the reverse . The idea of making the gold dollar larger in this way had been suggested in Congress as early as 1852 , and had been advocated by Pettit , but Guthrie 's desire for an annular coin stalled the matter . In May 1854 , Snowden sent Guthrie a letter stating that the difficulties with an annular coin , especially in getting the coins to eject properly from the press , was more than trivial .

Nevertheless , the Type 2 gold dollar ( as it came to be known ) proved unsatisfactory as the mints had difficulty in striking the new coin so that all details was brought out . This was due to the high relief of the design — the three Southern branch mints especially had trouble with the piece . Many of the Type 2 pieces quickly became illegible , and was sent back to Philadelphia for melting and recoinage . On most surviving specimens , the " 85 " in the date is not fully detailed . The Type 2 gold dollar was struck only at Philadelphia in 1854 and 1855 , at the three Southern branch mints in the latter year , and at San Francisco in 1856 , after the design was designated for replacement . To correct the problems , Longacre enlarged the head of Liberty , making it a scaled @-@ down version of the three @-@ dollar piece , and moved the lettering on the obverse closer to the rim . This improved the metal flow and design sharpness so much that early numismatic scholars assumed the reverse was also altered , though in fact no change was made and the Type 2 and Type 3 reverses are identical .

The gold dollar continued to be produced in the late 1850s , though mintages declined from the figures of two million or more each year between 1850 and 1854 . Only about 51 @,@ 000 gold dollars was produced in 1860 , with over two @-@ thirds of that figure at Philadelphia , just under a third at San Francisco , and 1 @,@ 566 at Dahlonega . Roughly a hundred are known of the last , creating one of the great rarities from Dahlonega in the series .

The other candidate for the rarest from that mint is the 1861 @-@ D , with an estimated mintage of 1 @,@ 000 and perhaps 45 to 60 known . Two pairs of dies was shipped from Philadelphia to Dahlonega on December 10 , 1860 ; they arrived on January 7 , 1861 , two weeks before Georgia voted to secede from the Union , as the American Civil War began . Under orders from Governor Joseph E. Brown , state militia secured the mint , and at some point , small quantities of dollars and half eagles was produced . Records of how many coins was struck and when have not survived . Since dies crack in time , and all the mints was supplied with them from Philadelphia , coining could not last , and in May 1861 , coins and supplies remaining at Dahlonega was turned over to the treasury of the Confederate States of America , which Georgia had by then joined . Gold coins with a face value of $ 6 was put aside for assay . Normally , they would have been sent to Philadelphia to await the following year 's meeting of the United States Assay Commission , when they would be available for testing . Instead , these was sent to the initial Confederate capital of Montgomery , Alabama , though what was done with them there , and their ultimate fate , are unknown . The rarity of the 1861 @-@ D dollar , and the association with the Confederacy , make it especially prized .

The outbreak of the Civil War shook public confidence in the Union , and citizens began hoarding specie , gold and silver coins . In late December 1861 , banks and then the federal Treasury stopped paying out gold at face value . By mid @-@ 1862 , all federal coins , even the base metal cent , had vanished from commerce in much of the country . The exception was the Far West , where for the most part , only gold and silver was acceptable currencies , and paper money traded at a discount . In the rest of the nation , gold and silver coins could be purchased from banks , exchange agents , and from the Treasury for a premium in the new greenbacks the government began to issue to fill the gap in commerce and finance the war .

Since gold did not circulate in the United States ( except on the West Coast ) in the postwar period , much of the production of coins of that metal in the United States was double eagles for export . Accordingly , although 1 @,@ 361 @,@ 355 gold dollars was struck in 1862 — the last time production would exceed a million — the mintage fell to 6 @,@ 200 in 1863 and remained low for the rest of the coin 's existence , excepting 1873 and 1874 . The Mint felt it improper to suspend coinage of a coin authorized by Congress , and issued proof coins ( generally a few dozen to the tiny numismatic community ) from specially @-@ polished dies , also producing enough circulation strikes so that the proof coins would not be unduly rare . In 1873 and 1874 , old and worn gold dollars held by the government was melted and recoined , generating large mintages of that denomination . This was done in anticipation of the resumption of specie payments , which did not occur until the end of 1878 . Once specie again circulated at face value , the gold dollar found no place in commerce amid large quantities of silver coinage , either released from hoarding or newly struck by the Mint . The government expected that the resumption of specie payments would cause the dollar and other small gold coins to circulate again , but the public , allowed to redeem paper currency , continued to use it as more convenient than coins .

In the 1870s and 1880s , public interest grew in the low @-@ mintage gold dollar . Collecting coins was becoming more popular , and a number of numismatists put aside some gold dollars and hoped for increases in value . The Mint most likely channeled its production through some favored Philadelphia dealers , though proof coins could be purchased for $ 1 @.@ 25 at the cashier 's window at the Philadelphia facility . Banks charged a premium for circulation strikes . They was popular in the jewelry trade , mounted into various items . The coins was often exported to China or Japan , where such jewelry was made . The dollars was often damaged in the process ; the Mint refused to sell into this trade and did its best to hinder it . Nevertheless , Mint officials concluded that jewelers was successful at getting the majority of each issue . Proof mintages exceeded 1 @,@ 000 by 1884 , and remained above that mark for the remainder of the series , numbers likely inflated by agents of jewelers , willing to pay the Mint 's premium of $ .25 per coin . Another use for the gold dollar was as a holiday gift ; after its abolition the quarter eagle became a popular present .

James Pollock , in his final report as Mint Director in 1873 , advocated limiting striking of gold dollars to depositors who specifically requested it . " The gold dollar is not a convenient coin , on account of its small size , and it suffer more proportionately from abrasion than larger coins . " His successors called for its abolition , with James P. Kimball , before he left office in 1889 , writing to Congress that except as jewelry , " little practical use have been found for this coin " . Later that year , the new director , Edward O. Leech , issued a report stating that the gold dollar " is too small for circulation , and ... [ is ] used almost exclusively for the purposes of ornament . The last year in which the gold dollar was struck was 1889 . Congress abolished the gold dollar , along with the three @-@ cent nickel and three @-@ dollar piece , by the Act of September 26 , 1890 .

A total of 19 @,@ 499 @,@ 337 gold dollars was coined , of which 18 @,@ 223 @,@ 438 was struck at Philadelphia , 1 @,@ 004 @,@ 000 at New Orleans , 109 @,@ 138 at Charlotte , 90 @,@ 232 at San Francisco and 72 @,@ 529 at Dahlonega . According to an advertisement in the February 1899 issue of The Numismatist , gold dollars brought $ 1 @.@ 80 each , still in demand as a birthday present and for jewelry . That journal in 1905 carried news of a customer depositing 100 gold dollars into a bank ; the teller , aware of the value , credited the account with $ 1 @.@ 60 per coin . In 1908 , a dealer offered $ 2 each for any quantity . As coin collecting became a widespread pastime in the early 20th century , gold dollars became a popular specialty , a status they retain . The 2014 edition of R.S. Yeoman 's A Guide Book of United States Coins rate the least expensive gold dollar in very fine condition ( VF @-@ 20 ) at $ 300 , a value given for each of the Type 1 Philadelphia issues from 1849 to 1853 . Those seeking one of each type will find the most expensive to be a specimen of the Type 2 , with the 1854 and 1855 estimated at $ 350 in that condition ; the other two types have dates valued at $ 300 in that grade .

The gold dollar had a brief resurrection during the period of Early United States commemorative coins . Between 1903 and 1922 nine different issues was produced , with a total mintage of 99 @,@ 799 . These was minted for various public events , did not circulate , and none used Longacre 's design .

The Johnson – Corey – Chaykovsky reaction ( sometimes referred to as the Corey – Chaykovsky reaction or CCR ) is a chemical reaction used in organic chemistry for the synthesis of epoxides , aziridines , and cyclopropanes . It was discovered in 1961 by A. William Johnson and developed significantly by E. J. Corey and Michael Chaykovsky . The reaction involve addition of a sulfur ylide to a ketone , aldehyde , imine , or enone to produce the corresponding 3 @-@ membered ring . The reaction is diastereoselective favoring trans substitution in the product regardless of the initial stereochemistry . The synthesis of epoxides via this method serve as an important retrosynthetic alternative to the traditional epoxidation reactions of olefins .

The reaction is most often employed for epoxidation via methylene transfer , and to this end have been used in several notable total syntheses ( See Synthesis of epoxides below ) . Additionally detailed below are the history , mechanism , scope , and enantioselective variants of the reaction . Several reviews have been published .

The reaction mechanism for the Johnson – Corey – Chaykovsky reaction consist of nucleophilic addition of the ylide to the carbonyl or imine group . A negative charge is transferred to the heteroatom and because the sulfonium cation is a good leaving group it get expelled forming the ring . In the related Wittig reaction , the formation of the much stronger phosphorus @-@ oxygen double bond prevent oxirane formation and instead , olefination take place through a 4 @-@ membered cyclic intermediate .

The degree of reversibility in the initial step ( and therefore the diastereoselectivity ) depend on four factors , with greater reversibility corresponding to higher selectivity :

The application of the Johnson – Corey – Chaykovsky reaction in organic synthesis is diverse . The reaction have come to encompass reactions of many types of sulfur ylides with electrophiles well beyond the original publications . It have seen use in a number of high @-@ profile total syntheses , as detailed below , and is generally recognized as a powerful transformative tool in the organic repertoire .

Use of a sulfoxonium allow more facile preparation of the reagent using weaker bases as compared to sulfonium ylides . ( The difference being that a sulfoxonium contain a doubly bonded oxygen whereas the sulfonium do not . ) The former react slower due to their increased stability . In addition , the dialkylsulfoxide by @-@ products of sulfoxonium reagents are greatly preferred to the significantly more toxic , volatile , and odorous dialkylsulfide by @-@ products from sulfonium reagents .

The reaction have been used in a number of notable total syntheses including the Danishefsky Taxol total synthesis , which produce the chemotherapeutic drug taxol , and the Kuehne Strychnine total synthesis which produce the pesticide strychnine .

The synthesis of aziridines from imines is another important application of the Johnson – Corey – Chaykovsky reaction and provide an alternative to amine transfer from oxaziridines . Though less widely applied , the reaction have a similar substrate scope and functional group tolerance to the carbonyl equivalent . The examples shown below are representative ; in the latter , an aziridine forms in situ and is opened via nucleophilic attack to form the corresponding amine .

For addition of sulfur ylides to enones , higher 1 @,@ 4 @-@ selectivity is typically obtained with sulfoxonium reagents than with sulfonium reagents . Many electron @-@ withdrawing groups have been shown compatible with the reaction including ketones , esters , and amides ( the example below involve a Weinreb amide ) . With further conjugated systems 1 @,@ 6 @-@ addition tend to predominate over 1 @,@ 4 @-@ addition .

With epoxides and aziridines the reaction serve as a ring @-@ expansion to produce the corresponding oxetane or azetidine . The long reaction times required for these reactions prevent them from occurring as significant side reactions when synthesizing epoxides and aziridines .

Several cycloadditions whereined the ylide serve as a " nucleophilic carbenoid equivalent " have been reported .

The development of an enantioselective ( i.e. yielding an enantiomeric excess , which is labelled as " ee " ) variant of the Johnson – Corey – Chaykovsky reaction remain an active area of academic research . The use of chiral sulfides in a stoichiometric fashion have proved more successful than the corresponding catalytic variants , but the substrate scope is still limited in all cases . The catalytic variants have been developed almost exclusively for enantioselective purposes ; typical organosulfide reagents are not prohibitively expensive and the racemic reactions can be carried out with equimolar amounts of ylide without raising costs significantly . Chiral sulfides , on the other hand , are more costly to prepare , spurring the advancement of catalytic enantioselective methods .

The most successful reagents employed in a stoichiometric fashion are shown below . The first is a bicyclic oxathiane that have been employed in the synthesis of the β @-@ adrenergic compound dichloroisoproterenol ( DCI ) but is limited by the availability of only one enantiomer of the reagent . The synthesis of the axial diastereomer is rationalized via the 1 @,@ 3 @-@ anomeric effect which reduce the nucleophilicity of the equatorial lone pair . The conformation of the ylide is limited by transannular strain and approach of the aldehyde is limited to one face of the ylide by steric interactions with the methyl substituents .

The other major reagent is a camphor @-@ derived reagent developed by Varinder Aggarwal of the University of Bristol . Both enantiomers are easily synthesized , although the yields are lower than for the oxathiane reagent . The ylide conformation is determined by interaction with the bridgehead hydrogens and approach of the aldehyde is blocked by the camphor moiety . The reaction employ a phosphazene base to promote formation of the ylide .

Catalytic reagents have been less successful , with most variations suffering from poor yield , poor enantioselectivity , or both . There are also issues with substrate scope , most having limitations with methylene transfer and aliphatic aldehydes . The trouble stem from the need for a nucleophilic sulfide that efficiently generate the ylide which can also act as a good leaving group to form the epoxide . Since the factors underlying these desiderata are at odds , tuning of the catalyst properties have proven difficult . Shown below are several of the most successful catalysts along with the yields and enantiomeric excess for their use in synthesis of ( E ) -stilbene oxide .

Aggarwal have developed an alternative method employing the same sulfide as above and a novel alkylation involving a rhodium carbenoid formed in situ . The method too have limited substrate scope , failing for any electrophiles possessing basic substituents due to competitive consumption of the carbenoid .

The treaty stipulated that Díaz , as well as his vice president Ramón Corral , was to step down by the end of May , and that he was to be replaced by Francisco León de la Barra as interim president and hold presidential elections . Those who had suffered losses due to the revolution would be the indemnified , and there would be a general amnesty . Díaz resigned on May 25 , and interim president Francisco León de la Barra was the new incumbent . Díaz and his family , his vice president Corral , plus José Yves Limantour and Rosendo Pineda left Mexico for exile .

Significantly , the treaty did not mention or institute any social reforms that Madero had vaguely promised on previous occasions . It also left the Porfirian state essentially intact . Additionally , Madero supported the unpopular idea that all land disputes was to be settled through the courts , staffed by the old judges , a decision that led to outbreaks of sporadic violence , particularly in rural areas .

Encouraged by the news of the uprisings , Madero crossed the border back into Mexico in February 1911 . He was joined by Pancho Villa and Orozco and in April the army began approaching Ciudad Juárez . Orozco and Villa led the way with 500 men each , while Madero followed up with 1 @,@ 500 riders . The city was besieged by the end of the month , after Madero 's army encountered some resistance in the Chihuahuan countryside . Madero asked the commander of the city 's garrison to surrender but the latter refused , hoping that the fortifications he had constructed would allow him to defend the city until reinforcements arrived . Concerned also with the possibility that a direct attack on the town would cause artillery shells to cross the border into the United States which could provoke an outside intervention , and faced with a series of peace proposals from Díaz , Madero hesitated in attacking the city . He in fact ordered his commanders to lift the siege . Orozco , however disregarded the order and , joined by Villa , attacked . After two days of fighting the city fell to the insurrectionists . Madero intervened personally to spare the life of the city 's commander , Gen. Navarro , whom both Orozco and Villa wanted executed for his previous killing of rebel POWs . This , coupled with the fact that both leaders was ignored by Madero in his political appointments , outraged and estranged them from him .

At about the same time that Villa and Orozco was marching on Ciudad Juárez , the Zapatista revolt gathered strength and spread to the states of Puebla , Tlaxcala , Mexico , Michoacán and Guerrero . On April 14 , Madero had Emiliano Zapata officially designated as his representative in the region . However , Zapata was worried that if he did not fully control all the major towns in Morelos by the time that Madero concluded negotiations with Díaz , the demands of his agrarian movement and the issue of the autonomy of Morelos would be ignored or sidelined . Zapata 's first military action was to take the town of Chinameca where he obtained essential supplies . Subsequently Zapata , for political and strategic reasons , decided to attack the city of Cuautla . In order to mislead his opponents however , he initially attacked and captured the towns of Izúcar de Matamoros ( which was subsequently retaken by federal forces ) and Chietla . From there he made a wide circle around Cuautla and captured Yautepec and Jonacatepec where he gathered more supplies , munitions and soldiers . By May , out of all the major urban centers in the region , only Cuautla and the capital of Morelos , Cuernavaca , remained outside of his control .

Zapata began the attack on Cuautla on May 13 with 4000 troops against 400 elite soldiers of the so @-@ called " Golden Fifth " ; the Fifth Cavalry Regiment of the Federal Army . The battle took almost a week and have been described as " six of the most terrible days of battle in the whole Revolution " . It consisted of house to house fighting , hand @-@ to @-@ hand combat , and no quarter given by either side . General Victoriano Huerta arrived in nearby Cuernavaca with 600 reinforcements , but decided not to come to the relief of Cuautla as he was afraid that the capital would revolt in his absence . On May 19 , the remains of the " Golden Fifth " pulled out of the town which was then occupied by Zapata 's soldiers .

The successful capture of Cuautla made Zapata a hero to ordinary people throughout Mexico and new corridos was written about him . After Zapata 's taking of Cuautla , the federal government controlled only five states and some urban areas . Porfirio Díaz himself later stated that , while he felt that he could defend against Villa and Orozco in Chihuahua , the fall of Cuautla was the event which persuaded him to agree to peace with Madero .