70-689: The Great Dorset Steam Fair (abbreviated GDSF , and since 2010 also known as The National Heritage Show ) is an annual show featuring steam-powered vehicles and machinery held in Dorset , England . It now covers 600 acres (2.4 km) and runs for five days. This used to be from the Wednesday after the UK August bank holiday, but from 2016 has been from the Thursday before the Bank Holiday until
140-447: A music group , singer , or musician who specifically plays the music of a well-known music act. Tribute acts include individual performers who mimic the songs and style of an artist, such as Elvis impersonators covering the works of Elvis Presley or groups like The Iron Maidens , an all-female band that pays tribute to Iron Maiden . Many tribute bands, in addition to playing the music of an artist or group, also try to emulate
210-413: A piston back and forth inside a cylinder . This pushing force can be transformed by a connecting rod and crank into rotational force for work. The term "steam engine" is most commonly applied to reciprocating engines as just described, although some authorities have also referred to the steam turbine and devices such as Hero's aeolipile as "steam engines". The essential feature of steam engines
280-782: A pun ), or on one of their songs or albums. In 1997, the British journalist Tony Barrell wrote a feature for The Sunday Times about the UK tribute-band scene, which mentioned bands including Pink Fraud, the Pretend Pretenders and Clouded House. In the article, Barrell asserted that "the main cradle of the tribute band...is Australia . Starved of big names, owing to their reluctance to put Oz on their tour itineraries, Australians were quite unembarrassed about creating home-grown versions. Then, like an airborne seed, one of these bands just happened to drift to Britain." The band in question
350-497: A closed space (e.g., combustion chamber , firebox , furnace). In the case of model or toy steam engines and a few full scale cases, the heat source can be an electric heating element . Boilers are pressure vessels that contain water to be boiled, and features that transfer the heat to the water as effectively as possible. The two most common types are: Fire-tube boilers were the main type used for early high-pressure steam (typical steam locomotive practice), but they were to
420-423: A common four-way rotary valve connected directly to a steam boiler. The next major step occurred when James Watt developed (1763–1775) an improved version of Newcomen's engine, with a separate condenser . Boulton and Watt 's early engines used half as much coal as John Smeaton 's improved version of Newcomen's. Newcomen's and Watt's early engines were "atmospheric". They were powered by air pressure pushing
490-438: A flywheel and crankshaft to provide rotative motion from an improved Newcomen engine. In 1720, Jacob Leupold described a two-cylinder high-pressure steam engine. The invention was published in his major work "Theatri Machinarum Hydraulicarum". The engine used two heavy pistons to provide motion to a water pump. Each piston was raised by the steam pressure and returned to its original position by gravity. The two pistons shared
560-423: A given cylinder size than previous engines and could be made small enough for transport applications. Thereafter, technological developments and improvements in manufacturing techniques (partly brought about by the adoption of the steam engine as a power source) resulted in the design of more efficient engines that could be smaller, faster, or more powerful, depending on the intended application. The Cornish engine
630-416: A large extent displaced by more economical water tube boilers in the late 19th century for marine propulsion and large stationary applications. Many boilers raise the temperature of the steam after it has left that part of the boiler where it is in contact with the water. Known as superheating it turns ' wet steam ' into ' superheated steam '. It avoids the steam condensing in the engine cylinders, and gives
700-494: A market, autojumble , live music and funfair (some of which is powered by the steam engines). The funfair has traditional rides such as gallopers and steam boats, as well as modern ones like the "World Fair Wheel" which was sited in Manchester for the millennium. It is the biggest gathering of fairground organs in the UK. The show regularly attracts around 200,000 visitors, and there can be 30,000 people on site, making
770-409: A partial vacuum by condensing steam under a piston within a cylinder. It was employed for draining mine workings at depths originally impractical using traditional means, and for providing reusable water for driving waterwheels at factories sited away from a suitable "head". Water that passed over the wheel was pumped up into a storage reservoir above the wheel. In 1780 James Pickard patented the use of
SECTION 10
#1732765995860840-405: A piston into the partial vacuum generated by condensing steam, instead of the pressure of expanding steam. The engine cylinders had to be large because the only usable force acting on them was atmospheric pressure . Watt developed his engine further, modifying it to provide a rotary motion suitable for driving machinery. This enabled factories to be sited away from rivers, and accelerated
910-433: A set speed, because it would assume a new constant speed in response to load changes. The governor was able to handle smaller variations such as those caused by fluctuating heat load to the boiler. Also, there was a tendency for oscillation whenever there was a speed change. As a consequence, engines equipped only with this governor were not suitable for operations requiring constant speed, such as cotton spinning. The governor
980-522: A significantly higher efficiency . In a steam engine, a piston or steam turbine or any other similar device for doing mechanical work takes a supply of steam at high pressure and temperature and gives out a supply of steam at lower pressure and temperature, using as much of the difference in steam energy as possible to do mechanical work. These "motor units" are often called 'steam engines' in their own right. Engines using compressed air or other gases differ from steam engines only in details that depend on
1050-414: A steam jet usually supplied from the boiler. Injectors became popular in the 1850s but are no longer widely used, except in applications such as steam locomotives. It is the pressurization of the water that circulates through the steam boiler that allows the water to be raised to temperatures well above 100 °C (212 °F) boiling point of water at one atmospheric pressure, and by that means to increase
1120-445: A steam pump that used steam pressure operating directly on the water. The first commercially successful engine that could transmit continuous power to a machine was developed in 1712 by Thomas Newcomen . James Watt made a critical improvement in 1764, by removing spent steam to a separate vessel for condensation, greatly improving the amount of work obtained per unit of fuel consumed. By the 19th century, stationary steam engines powered
1190-628: A steam rail locomotive was designed and constructed by steamboat pioneer John Fitch in the United States probably during the 1780s or 1790s. His steam locomotive used interior bladed wheels guided by rails or tracks. The first full-scale working railway steam locomotive was built by Richard Trevithick in the United Kingdom and, on 21 February 1804, the world's first railway journey took place as Trevithick's steam locomotive hauled 10 tones of iron, 70 passengers and five wagons along
1260-612: A trio of locomotives, concluding with the Catch Me Who Can in 1808. Only four years later, the successful twin-cylinder locomotive Salamanca by Matthew Murray was used by the edge railed rack and pinion Middleton Railway . In 1825 George Stephenson built the Locomotion for the Stockton and Darlington Railway . This was the first public steam railway in the world and then in 1829, he built The Rocket which
1330-561: A very limited lift height and were prone to boiler explosions . Savery's engine was used in mines, pumping stations and supplying water to water wheels powering textile machinery. One advantage of Savery's engine was its low cost. Bento de Moura Portugal introduced an improvement of Savery's construction "to render it capable of working itself", as described by John Smeaton in the Philosophical Transactions published in 1751. It continued to be manufactured until
1400-473: A water pump for draining inundated mines. Frenchman Denis Papin did some useful work on the steam digester in 1679, and first used a piston to raise weights in 1690. The first commercial steam-powered device was a water pump, developed in 1698 by Thomas Savery . It used condensing steam to create a vacuum which raised water from below and then used steam pressure to raise it higher. Small engines were effective though larger models were problematic. They had
1470-636: A wide variety of musical tastes. The festival included five stages: the Main Stage, Real Ale Stage, Folk Stage, Country & Western Marquee and the Black Bull Marquee. Bands featured were mainly tribute acts , including the Bootleg Beatles . In 2009, the Main Stage was changed from being inside a marquee to an outdoor concert stage. This required a concert ticket to be purchased unlike the other marquees that are free to visitors of
SECTION 20
#17327659958601540-431: Is cylinder condensation and re-evaporation. The steam cylinder and adjacent metal parts/ports operate at a temperature about halfway between the steam admission saturation temperature and the saturation temperature corresponding to the exhaust pressure. As high-pressure steam is admitted into the working cylinder, much of the high-temperature steam is condensed as water droplets onto the metal surfaces, significantly reducing
1610-640: Is generally credited as the founder of the Great Dorset Steam Fair. A roster of participating individuals taken from the first event's souvenir program and guide in September 1969 includes: The list is as follows; President; Mr G. J. Romanes, M.A, M.R.C.S, D.O.M.S. Vice President; Mr E.C. Hines. Chairman; Mr J. E. B. Pocock Vice Chairman; Mr M. F. Oliver Treasurer; Mr N. J. Fincham Public relations officer; Mr A. Imber. Joint secretaries; Mr & Mrs J. Cluet. Sub committee for
1680-496: Is that they are external combustion engines , where the working fluid is separated from the combustion products. The ideal thermodynamic cycle used to analyze this process is called the Rankine cycle . In general usage, the term steam engine can refer to either complete steam plants (including boilers etc.), such as railway steam locomotives and portable engines , or may refer to the piston or turbine machinery alone, as in
1750-399: Is then pumped back up to pressure and sent back to the boiler. A dry-type cooling tower is similar to an automobile radiator and is used in locations where water is costly. Waste heat can also be ejected by evaporative (wet) cooling towers, which use a secondary external water circuit that evaporates some of flow to the air. River boats initially used a jet condenser in which cold water from
1820-542: Is vented up the chimney so as to increase the draw on the fire, which greatly increases engine power, but reduces efficiency. Sometimes the waste heat from the engine is useful itself, and in those cases, very high overall efficiency can be obtained. Steam engines in stationary power plants use surface condensers as a cold sink. The condensers are cooled by water flow from oceans, rivers, lakes, and often by cooling towers which evaporate water to provide cooling energy removal. The resulting condensed hot water ( condensate ),
1890-468: The Rumford Medal , the committee said that "no one invention since Watt's time has so enhanced the efficiency of the steam engine". In addition to using 30% less steam, it provided more uniform speed due to variable steam cut off, making it well suited to manufacturing, especially cotton spinning. The first experimental road-going steam-powered vehicles were built in the late 18th century, but it
1960-418: The beam engine and stationary steam engine . As noted, steam-driven devices such as the aeolipile were known in the first century AD, and there were a few other uses recorded in the 16th century. In 1606 Jerónimo de Ayanz y Beaumont patented his invention of the first steam-powered water pump for draining mines. Thomas Savery is considered the inventor of the first commercially used steam powered device,
2030-626: The tramway from the Pen-y-darren ironworks, near Merthyr Tydfil to Abercynon in south Wales . The design incorporated a number of important innovations that included using high-pressure steam which reduced the weight of the engine and increased its efficiency. Trevithick visited the Newcastle area later in 1804 and the colliery railways in north-east England became the leading centre for experimentation and development of steam locomotives. Trevithick continued his own experiments using
2100-514: The 1860s to the 1920s. Steam road vehicles were used for many applications. In the 20th century, the rapid development of internal combustion engine technology led to the demise of the steam engine as a source of propulsion of vehicles on a commercial basis, with relatively few remaining in use beyond the Second World War . Many of these vehicles were acquired by enthusiasts for preservation, and numerous examples are still in existence. In
2170-562: The 1960s, the air pollution problems in California gave rise to a brief period of interest in developing and studying steam-powered vehicles as a possible means of reducing the pollution. Apart from interest by steam enthusiasts, the occasional replica vehicle, and experimental technology, no steam vehicles are in production at present. Near the end of the 19th century, compound engines came into widespread use. Compound engines exhausted steam into successively larger cylinders to accommodate
Great Dorset Steam Fair - Misplaced Pages Continue
2240-408: The 20th century, where their efficiency, higher speed appropriate to generator service, and smooth rotation were advantages. Today most electric power is provided by steam turbines. In the United States, 90% of the electric power is produced in this way using a variety of heat sources. Steam turbines were extensively applied for propulsion of large ships throughout most of the 20th century. Although
2310-701: The Bank Holiday itself. It is reputedly the largest collection of steam and vintage equipment to be seen anywhere in the world. The fair was founded by the Dorset Steam & Historic Vehicle Club, and has been held every summer since 1969. The show is now organised by Michael Oliver's son, Martin Oliver, through Great Dorset Steam Fair Ltd. Following a meeting of like-minded individuals held in The Royal Oak in Okeford Fitzpaine , north Dorset,
2380-475: The atmosphere or into a condenser. As steam expands in passing through a high-pressure engine, its temperature drops because no heat is being added to the system; this is known as adiabatic expansion and results in steam entering the cylinder at high temperature and leaving at lower temperature. This causes a cycle of heating and cooling of the cylinder with every stroke, which is a source of inefficiency. The dominant efficiency loss in reciprocating steam engines
2450-404: The boiler and engine in separate buildings some distance apart. For portable or mobile use, such as steam locomotives , the two are mounted together. The widely used reciprocating engine typically consisted of a cast-iron cylinder, piston, connecting rod and beam or a crank and flywheel, and miscellaneous linkages. Steam was alternately supplied and exhausted by one or more valves. Speed control
2520-401: The efficiency of the steam cycle. For safety reasons, nearly all steam engines are equipped with mechanisms to monitor the boiler, such as a pressure gauge and a sight glass to monitor the water level. Many engines, stationary and mobile, are also fitted with a governor to regulate the speed of the engine without the need for human interference. The most useful instrument for analyzing
2590-405: The event; T. M. Abbot, J. Antell, A. S. Braddick, J. Cluet, A. W. Field, G. A. Fincham, N. J. Fincham. F. Franklin, S. J. Garrett, H. Gray, E. C. Hine, A. Imber, G. J. Romanes. Secretary M. F. Oliver. Steam engine A steam engine is a heat engine that performs mechanical work using steam as its working fluid . The steam engine uses the force produced by steam pressure to push
2660-501: The factories of the Industrial Revolution . Steam engines replaced sails for ships on paddle steamers , and steam locomotives operated on the railways. Reciprocating piston type steam engines were the dominant source of power until the early 20th century. The efficiency of stationary steam engine increased dramatically until about 1922. The highest Rankine Cycle Efficiency of 91% and combined thermal efficiency of 31%
2730-493: The fair the fifth largest population centre in Dorset, after Bournemouth , Poole , Weymouth and Christchurch (the population of the historic town of Dorchester being only half that number). A speciality of the show is the display of traction engines and steam rollers performing the work for which they were designed. Such displays include heavy haulage, threshing , sawing logs, ploughing and road-making. The main arena of
2800-547: The fair. 2009 saw the start of a new event called Steam Sounds that showcases acts from around the local area on the outdoor stage. The Main Stage is now free to all and does not require a ticket for entry as of 2014 On 31 August 2013, GDSF set a new Guinness World Record for the largest parade of steam rollers , when 103 rollers were driven into the main arena for a photo call. The previous record for moving rollers had been set by GDSF in 2003 with 32 steam rollers. Michael Oliver
2870-426: The first fair was held in 1969. For the first 15 years of its existence the steam fair (then known as the 'Great Working of Steam Engines') was held at Stourpaine Bushes, then in 1985 it temporarily moved to nearby Everley Hill, as Bushes Farm were delayed in harvesting the crops from the fields used by the steam fair due to the weather conditions. In 1988, after three years at Everley Hill, where access by large crowds
Great Dorset Steam Fair - Misplaced Pages Continue
2940-463: The higher volumes at reduced pressures, giving improved efficiency. These stages were called expansions, with double- and triple-expansion engines being common, especially in shipping where efficiency was important to reduce the weight of coal carried. Steam engines remained the dominant source of power until the early 20th century, when advances in the design of the steam turbine , electric motors , and internal combustion engines gradually resulted in
3010-429: The late 18th century. At least one engine was still known to be operating in 1820. The first commercially successful engine that could transmit continuous power to a machine was the atmospheric engine , invented by Thomas Newcomen around 1712. It improved on Savery's steam pump, using a piston as proposed by Papin. Newcomen's engine was relatively inefficient, and mostly used for pumping water. It worked by creating
3080-399: The nature of the gas although compressed air has been used in steam engines without change. As with all heat engines, the majority of primary energy must be emitted as waste heat at relatively low temperature. The simplest cold sink is to vent the steam to the environment. This is often used on steam locomotives to avoid the weight and bulk of condensers. Some of the released steam
3150-518: The pace of the Industrial Revolution. The meaning of high pressure, together with an actual value above ambient, depends on the era in which the term was used. For early use of the term Van Reimsdijk refers to steam being at a sufficiently high pressure that it could be exhausted to atmosphere without reliance on a vacuum to enable it to perform useful work. Ewing 1894 , p. 22 states that Watt's condensing engines were known, at
3220-456: The performance of steam engines is the steam engine indicator. Early versions were in use by 1851, but the most successful indicator was developed for the high speed engine inventor and manufacturer Charles Porter by Charles Richard and exhibited at London Exhibition in 1862. The steam engine indicator traces on paper the pressure in the cylinder throughout the cycle, which can be used to spot various problems and calculate developed horsepower. It
3290-456: The piston axis in vertical position. In time the horizontal arrangement became more popular, allowing compact, but powerful engines to be fitted in smaller spaces. The acme of the horizontal engine was the Corliss steam engine , patented in 1849, which was a four-valve counter flow engine with separate steam admission and exhaust valves and automatic variable steam cutoff. When Corliss was given
3360-406: The reciprocating steam engine is no longer in widespread commercial use, various companies are exploring or exploiting the potential of the engine as an alternative to internal combustion engines. There are two fundamental components of a steam plant: the boiler or steam generator , and the "motor unit", referred to itself as a "steam engine". Stationary steam engines in fixed buildings may have
3430-417: The replacement of reciprocating (piston) steam engines, with merchant shipping relying increasingly upon diesel engines , and warships on the steam turbine. As the development of steam engines progressed through the 18th century, various attempts were made to apply them to road and railway use. In 1784, William Murdoch , a Scottish inventor, built a model steam road locomotive. An early working model of
3500-578: The river is injected into the exhaust steam from the engine. Cooling water and condensate mix. While this was also applied for sea-going vessels, generally after only a few days of operation the boiler would become coated with deposited salt, reducing performance and increasing the risk of a boiler explosion. Starting about 1834, the use of surface condensers on ships eliminated fouling of the boilers, and improved engine efficiency. Evaporated water cannot be used for subsequent purposes (other than rain somewhere), whereas river water can be re-used. In all cases,
3570-531: The show has contracted its own radio station, Steam Fair FM, broadcasting 24 hours daily on 87.9 FM from the Sunday prior to the show, to the Tuesday following – ten days in all. The station, which is also streamed on the internet, covers show news and views, weather and other relevant information with plenty of listener dedications and a format of "Vintage Hits". During the event, the station is advertised on roads in
SECTION 50
#17327659958603640-403: The show is purposely sited on the slope of a hill to allow both steam- and internal combustion-powered machinery to demonstrate their capacity for heavy load hauling. One of the main displays is the "Showman's Line up", in the vintage fairground section, which is thought to be the largest collection of showman's engines in the world. More than 60 showman's engines were present in 2004. Since 2003,
3710-399: The steam available for expansive work. When the expanding steam reaches low pressure (especially during the exhaust stroke), the previously deposited water droplets that had just been formed within the cylinder/ports now boil away (re-evaporation) and this steam does no further work in the cylinder. Tribute acts A tribute act , tribute band , tribute group or tribute artist is
3780-412: The steam plant boiler feed water, which must be kept pure, is kept separate from the cooling water or air. Most steam boilers have a means to supply water whilst at pressure, so that they may be run continuously. Utility and industrial boilers commonly use multi-stage centrifugal pumps ; however, other types are used. Another means of supplying lower-pressure boiler feed water is an injector , which uses
3850-542: The surrounding area and provides traffic news for drivers using the A354 Blandford to Salisbury road that passes the show site. For the 40th anniversary, in 2008, the organisers recreated the very first fair, by tracing all of the exhibits that were displayed at the 1969 show. 2008 saw the start of the Dorset Sound Festival , a music event that is held alongside the main fair, designed to entertain
3920-489: The temperature of the steam above its saturated vapour point, and various mechanisms to increase the draft for fireboxes. When coal is used, a chain or screw stoking mechanism and its drive engine or motor may be included to move the fuel from a supply bin (bunker) to the firebox. The heat required for boiling the water and raising the temperature of the steam can be derived from various sources, most commonly from burning combustible materials with an appropriate supply of air in
3990-482: The time, as low pressure compared to high pressure, non-condensing engines of the same period. Watt's patent prevented others from making high pressure and compound engines. Shortly after Watt's patent expired in 1800, Richard Trevithick and, separately, Oliver Evans in 1801 introduced engines using high-pressure steam; Trevithick obtained his high-pressure engine patent in 1802, and Evans had made several working models before then. These were much more powerful for
4060-489: The vocal styles and overall appearance of that group, to make as close an approximation as possible. Others introduce a twist on the original act; for example, Dread Zeppelin plays Led Zeppelin songs in a reggae style with a lead singer dressed up as Elvis Presley , while Gabba perform the songs of ABBA in the style of the Ramones . Tribute bands usually name themselves based on the original band's name (sometimes with
4130-627: Was demonstrated and published in 1921 and 1928. Advances in the design of electric motors and internal combustion engines resulted in the gradual replacement of steam engines in commercial usage. Steam turbines replaced reciprocating engines in power generation, due to lower cost, higher operating speed, and higher efficiency. Note that small scale steam turbines are much less efficient than large ones. As of 2023 , large reciprocating piston steam engines are still being manufactured in Germany. As noted, one recorded rudimentary steam-powered engine
4200-546: Was developed by Trevithick and others in the 1810s. It was a compound cycle engine that used high-pressure steam expansively, then condensed the low-pressure steam, making it relatively efficient. The Cornish engine had irregular motion and torque through the cycle, limiting it mainly to pumping. Cornish engines were used in mines and for water supply until the late 19th century. Early builders of stationary steam engines considered that horizontal cylinders would be subject to excessive wear. Their engines were therefore arranged with
4270-746: Was difficult, it moved to its current permanent home at Tarrant Hinton , north of Blandford Forum , where access is vastly improved. The fair now attracts up to 200,000 visitors. In 2020, the event was cancelled for the first time since its inception due to the COVID-19 pandemic . The event was not held in 2023 and in November 2023, the 2024 steam fair was cancelled over rising costs. The most numerous exhibits are traction engines , tractors and farm machinery, but there are also sections for classic cars and commercial vehicles, working shire horses , rustic crafts, 'bygones' displays, and more. The show also has
SECTION 60
#17327659958604340-450: Was either automatic, using a governor, or by a manual valve. The cylinder casting contained steam supply and exhaust ports. Engines equipped with a condenser are a separate type than those that exhaust to the atmosphere. Other components are often present; pumps (such as an injector ) to supply water to the boiler during operation, condensers to recirculate the water and recover the latent heat of vaporisation, and superheaters to raise
4410-531: Was entered in and won the Rainhill Trials . The Liverpool and Manchester Railway opened in 1830 making exclusive use of steam power for both passenger and freight trains. Steam locomotives continued to be manufactured until the late twentieth century in places such as China and the former East Germany (where the DR Class 52.80 was produced). The final major evolution of the steam engine design
4480-411: Was improved over time and coupled with variable steam cut off, good speed control in response to changes in load was attainable near the end of the 19th century. In a simple engine, or "single expansion engine" the charge of steam passes through the entire expansion process in an individual cylinder, although a simple engine may have one or more individual cylinders. It is then exhausted directly into
4550-479: Was not until after Richard Trevithick had developed the use of high-pressure steam, around 1800, that mobile steam engines became a practical proposition. The first half of the 19th century saw great progress in steam vehicle design, and by the 1850s it was becoming viable to produce them on a commercial basis. This progress was dampened by legislation which limited or prohibited the use of steam-powered vehicles on roads. Improvements in vehicle technology continued from
4620-601: Was replaced by Tim "Ripper" Owens from the tribute band British Steel in 1996. This was the first publicised example of a tribute performer joining the band they were paying tribute to and was the inspiration for the 2001 film Rock Star . Owens eventually left Judas Priest in 2003 when Halford rejoined the band. Later occurrences of this same phenomenon include Tommy Thayer replacing Ace Frehley in Kiss in 2002 and Benoît David replacing Jon Anderson in Yes after performing with
4690-496: Was routinely used by engineers, mechanics and insurance inspectors. The engine indicator can also be used on internal combustion engines. See image of indicator diagram below (in Types of motor units section). The centrifugal governor was adopted by James Watt for use on a steam engine in 1788 after Watt's partner Boulton saw one on the equipment of a flour mill Boulton & Watt were building. The governor could not actually hold
4760-763: Was the aeolipile described by Hero of Alexandria , a Hellenistic mathematician and engineer in Roman Egypt during the first century AD. In the following centuries, the few steam-powered engines known were, like the aeolipile, essentially experimental devices used by inventors to demonstrate the properties of steam. A rudimentary steam turbine device was described by Taqi al-Din in Ottoman Egypt in 1551 and by Giovanni Branca in Italy in 1629. The Spanish inventor Jerónimo de Ayanz y Beaumont received patents in 1606 for 50 steam-powered inventions, including
4830-553: Was the ABBA tribute Björn Again , who staged a successful publicity stunt in the early 1990s, arriving at Heathrow Airport in white one-piece outfits similar to the ones worn by ABBA on the cover of their 1976 album, Arrival . Other tribute acts such as The Beatnix (Beatles), Zeppelin Live, and The Australian Pink Floyd Show have experienced continued popularity for over a decade. Lead singer Rob Halford left Judas Priest in 1992 and
4900-438: Was the use of steam turbines starting in the late part of the 19th century. Steam turbines are generally more efficient than reciprocating piston type steam engines (for outputs above several hundred horsepower), have fewer moving parts, and provide rotary power directly instead of through a connecting rod system or similar means. Steam turbines virtually replaced reciprocating engines in electricity generating stations early in
#859140