highly developed engine

— ablation-protected engine

— ablative engine

— abort engine

— accelerating rocket engine

— acid-cooled rocket engine

— actual engine

— adjustable-thrust rocket engine

— aerojet engine

— aeropulse engine

— aerothermodynamic integration engine

— afterburning engine

— aft-fan engine

— ailing engine

— air engine

— airborne rocket engine

— air-breathing engine

— air-burning engine

— air-collection engine

— air-feed engine

— air-jet engine

— airline engine

— airplane engine

— airstream engine

— alcohol engine

— all-attitude engine

— all-fuel engine

— ancillary engine

— annihilation rocket engine

— antispin rocket engine

— apogee engine

— arcjet engine

— arresting engine

— ascent engine

— assist-climb rocket engine

— assisted takeoff engine

— atmospheric jet engine

— attitude-control engine

— augmented turbofan engine

— auxiliary rocket engine

— axial engine

— axial-centrifugal-flow engine

— axial-flow engine

— bare engine

— barrel engine

— basic engine

— below-wing engine

— bench engine

— bifuel rocket engine

— bipropellant rocket engine

— bleedoff rocket engine

— block-cast engine

— booster engine

— bottom engine

— brake engine

— braking engine

— buried engine

— burned engine

— bypass engine

— calibrated engine

— calibrated-thrust engine

— capacitative-cooled engine

— capsular engine

— carburetted engine

— carburettor engine

— center engine

— centrifugal-flow engine

— ceramic-coated engine

— cesium-ion engine

— chemical fuel engine

— chemical-ignition engine

— cigarette-burning rocket engine

— clear the engine

— closed-cycle engine

— clustered engine

— coaxial plasma engine

— cold engine

— cold-jet engine

— cold-reaction engine

— combustion engine

— composite engine

— compound engine

— compressorless engine

— conk-out engine

— constant-duty engine

— constant-speed engine

— constant-thrust engine

— control engine

— controllable-thrust engine

— cooled engine

— core engine

— coupled engines

— cowled engine

— critical engine

— cruise engine

— cruising engine

— cryogenic engine

— cut the engine

— dead engine

— deflected-thrust engine

— demonstrator engine

— deorbit engine

— descent engine

— development engine

— direct-drive engine

— direct-injection engine

— direct-lift engine

— disintegrating engine

— diverted-jet engine

— docking engine

— double-flow engine

— double-nozzled engine

— double-row engine

— double-unit engine

— down-rated engine

— downwind engine

— driving engine

— droppable engine

— dry engine

— dry-fuel rocket engine

— dry-sump engine

— dual function engine

— dual-chamber rocket engine

— dual-flow engine

— dual-thrust rocket engine

— ducted rocket engine

— ducted-fan engine

— duplex engine

— earth-satellite engine

— ejection-seat rocket engine

— ejector-seat rocket engine

— electrical rocket engine

— electric-ignition engine

— electromagnetic jet engine

— electrostatic rocket engine

— electrothermal jet engine

— end-burning rocket engine

— engine got sick

— engine out

— environmental engine

— escape rocket engine

— evaporative-cooled engine

— expendable engine

— expended engine

— explosive engine

— external engine

— external-burning engine

— failed engine

— fan engine

— fan-afterburner engine

— fan-burning jet engine

— fast-response rocket engine

— feathered engine

— film-cooled engine

— final-stage rocket engine

— finite-thrust engine

— finned-rocket engine

— first-stage engine

— fixed-geometry engine

— flame-ignition rocket engine

— flameout engine

— flat engine

— flat-rated engine

— flat-rating engine

— flight-cleared engine

— flight-qualified engine

— flight-type engine

— flightworthy engine

— flyable engine

— forced-induction engine

— forward-facing rocket engine

— forward-firing rocket engine

— forward-thrust jet engine

— four-chamber engine

— four-stroke engine

— free-turbine engine

— front-fan engine

— fuel-optimal engine

— full-scale engine

— full-sized engine

— fuselage-mounted engine

— gas-generator engine

— gasoline engine

— gas-pressurized rocket engine

— gas-turbine engine

— geared engine

— gearless engine

— good engine

— gun an engine

— healthy engine

— heat engine

— heat-sponge engine

— helicopter engine

— helium-injection engine

— high-bypass ratio engine

— high-compression-ratio engine

— higher-powered engine

— highly developed engine

— high-performance engine

— high-power engine

— high-pressure engine

— high-speed engine

— high-thrust engine

— high-time engine

— honeycomb engine

— horizontal-mounted engine

— hot engine

— hot peroxide engine

— hot-reaction rocket engine

— hybrid engine

— hybrid-propellant engine

— hydrazine engine

— hydrogen-burning engine

— hydrogen-electrothermal engine

— hydrogen-fluorine engine

— hydrogen-oxygen engine

— hydrogen-peroxide engine

— hydrojet engine

— hypergolic engine

— hypersonic engine

— hypothetical engine

— ideal-cycle engine

— idling engine

— ignite the engine

— impulse-duct engine

— impulse-rocket engine

— inboard engine

— inhibited engine

— injected engine

— in-line engine

— inoperative engine

— installed engine

— intermittent-cycle engine

— intermittent-detonation engine

— internal engine

— internal-combustion engine

— interplanetary engine

— inverted vee engine

— ionic engine

— ionospheric ramjet engine

— isentropic engine

— jato engine

— jet attitude engine

— jet-propulsion engine

— jet transport engine

— jet-control engine

— jet-lift engine

— jettison engine

— jumbo engine

— kerosene-burning engine

— kerosene-fueled engine

— kick engine

— kill the engine

— lander engine

— lateral-burning rocket engine

— launch vehicle engine

— launching rocket engine

— left-handed engine

— lift jet engine

— lift/propulsion engine

— lift/thrust engine

— lift-cruise engine

— liftoff engine

— lightweight engine

— limited-life engine

— limited-thrust engine

— liquid-air engine

— liquid-chemical rocket engine

— liquid-cooled engine

— liquid-fuelrocket engine

— liquid-oxygen rocket engine

— liquid-propellant rocket engine

— liquid-solid rocket engine

— liquid-sustainer engine

— live engine

— long-burning engine

— long-duration engine

— long-life engine

— long-period engine

— long-stroke engine

— low-altitude engine

— low-consumption engine

— lower-powered engine

— low-mounted engine

— low-noise-level engine

— low-performance engine

— low-pressure engine

— low-thrust engine

— lox/liquid hydrogen engine

— lunar engine

— lunar module engine

— lunar rover engine

— lunar-descent engine

— lunar-takeoff engine

— magnetic-pinch plasma engine

— magnetogasdynamie engine

— magnetohydrodynamic engine

— main engine

— main propulsion engine

— malfunctioning engine

— maneuvering engine

— master engine

— matched engine

— microrocket engine

— midcourse correction engine

— middle engine

— military engine

— missile engine

— modular engine

— monopropellant rocket engine

— monopropellant-plus-fuel engine

— movable engine

— multibank engine

— multichamber rocket engine

— multifuel engine

— multilift engines

— multiple engine

— multiple-beam ion engine

— multiple-chamber rocket engine

— multiple-nozzle engine

— multirow engine

— multi-unit rocket engine

— nacelle-mounted engine

— nameplate engine

— nonafterburning engine

— noncryogenic engine

— nonexpendable engine

— nonregenerative engine

— non-supercharged engine

— nonthrottleable engine

— nonthrust rocket engine

— nuclear-electric engine

— nuclear-fission engine

— one-flow engine

— one-shaft engine

— one-shot engine

— one-spool engine

— open-cycle engine

— operational engine

— opposed-cylinder engine

— opposed-piston engine

— orbital module engine

— orbiter engine

— orbiting ramjet engine

— ordnance turbojet engine

— orienting-thrust engine

— outboard engine

— outer engine

— outer-space engine

— overcooled engine

— oversized engine

— oxidizer-cooled rocket engine

— paired engine

— paper engine

— parallel booster engines

— peroxide engine

— petrol engine

— photon engine

— pickle an engine

— pilot engine

— piston-driven engine

— pitch-control jet engine

— pivoted engine

— plasma engine

— plasmajet engine

— plenum-chamber-burning engine

— plug-in engine

— plug-nozzle engine

— podded engine

— pod-mounted engine

— porous-cooled engine

— powder rocket engine

— powerful engine

— power-limited engine

— preproduction engine

— pressure-feed engine

— propellant-cooled engine

— propulsion engine

— propulsive jet engine

— pulse reaction engine

— pulsejet engine

— pump-fed rocket engine

— pure lift engine

— pylon-mounted engine

— quadruple-chamber rocket engine

— quantum engine

— quiet engine

— race the engine

— radial engine

— radioisotope engine

— ramjet engine

— rato engine

— RCS engine

— reaction propulsion engine

— real engine

— reciprocating engine

— recombination ramjet engine

— refractory-liner rocket engine

— regenerative engine

— regeneratively-cooled engine

— reheated engine

— relight the engine

— rematched engine

— remotely-controlled engine

— replace the engine

— replacement engine

— research engine

— resonant jet engine

— restartable engine

— restricted-burning rocket engine

— retarding rocket engine

— retractable engine

— retrofire rocket engine

— retrograde rocket engine

— retrorocket engine

— retrothrust engine

— return engine

— reusable engine

— reversed engine

— reverse-thrust rocket engine

— right-handed engine

— ring engine

— rocket engine

— rocket-ramjet engine

— roll-control jet engine

— rotary engine

— rotatable-nozzles engine

— rough-running engine

— rubber engine

— run down engine

— running engine

— satellite-like engine

— scaled-down engine

— scaled-up engine

— sealed rocket engine

— sea-level engine

— secondary engine

— second-stage engine

— segmented-rocket engine

— selfcontained-rocket engine

— separable engine

— separation engine

— series-produced engine

— service engine

— service propulsion engine

— shaft-turbine engine

— short-burning engine

— short-duration engine

— short-life engine

— short-period engine

— short-stroke engine

— shut-down engine

— shuttle engine

— side engine

— side-burning rocket engine

— simulated failed engine

— single-barrelled rocket engine

— single-chamber rocket engine

— single-nozzle engine

— single-row engine

— single-shaft engine

— single-shot engine

— single-start engine

— sleeve-valve engine

— smoke-free engine

— smokeless engine

— smoky engine

— solar engine

— solid sustainer engine

— solid-liquid rocket engine

— solid-propellant boost engine

— solid-propellant rocket engine

— space engine

— space shuttle engine

— space vehicle engine

— spaceborne engine

— spacecraft engine

— spare engine

— spark-ignition engine

— spindown engine

— spinup engine

— split-compressor engine

— stage engine

— stage-one engine

— start the engine

— starting engine

— station-keeping engine

— steam-burning rocket engine

— steerable rocket engine

— steering engine

— stopcock the engine

— storable liquid-propellant engine

— straight-jet engine

— strap-on engine

— study engine

— submerged engine

— subscale engine

— subsonic jet engine

— supercharged engine

— supercompression engine

— superperformance engine

— supersonic combustion engine

— supersonic jet engine

— supplementary engine

— surge-free engine

— sustainer engine

— sustaining engine

— sweat-cooled engine

— swiveling engine

— swiveling-nozzle engine

— symmetrically opposite engine

— tail-mounted engine

— takeoff rocket engine

— tandem boost engine

— test engine

— testbed engine

— thermal-jet engine

— thermionic engine

— thermochemical rocket engine

— thermojet engine

— thermonuclear rocket engine

— three-barreled engine

— three-chambered engine

— three-shaft engine

— three-spool engine

— throttleable engine

— throttled back engine

— thrust engine

— tiltable engine

— tilting engine

— tiny engine

— tip engine

— trajectory-correction engine

— transonic engine

— transpiration-cooled rocket engine

— transtage engine

— traveling-wave plasma engine

— tri-chamber engine

— trim rocket engine

— triple-barreled engine

— triple-chamber engine

— turbine engine

— turboelectric engine

— turbofan engine

— turbofanramjet engine

— turbofed engine

— turbojet engine

— turboprop engine

— turbopump rocket engine

— turboram rocket engine

— turboramjet engine

— turborocket engine

— turbosupercharged engine

— twin-combustion-chamber engine

— twin-shaft engine

— two-chamber engine

— two-dimensional-ion engine

— two-propellants rocket engine

— two-row engine

— two-segment engine

— two-shaft engine

— two-spool engine

— uncooled rocket engine

— underslung engine

— underwing engine

— unreheated engine

— unrestricted-burning rocket engine

— unsegmented engine

— unsilenced engine

— unsupercharged engine

— upper-stage engine

— uprated engine

— upwind engine

— V/STOL engine

— valveless engine

— vapor-cycle-cooled engine

— vaporization-cooled engine

— variable-geometry engine

— variable-thrust engine

— vectorable engine

— vectored-thrust engine

— vee engine

— vernier engine

— vertical lift engine

— vertical-mounted engine

— vibration-free engine

— Wankel engine

— warmed engine

— water-cooled engine

— water-injection engine

— wet-sump engine

— widely-throttleable engine

— wing pod engine

— wing-mounted engine

— wing-root-buried engine

— wingtip-mounted engine

— wlndmllling engine

— wraparound boost engine

— zero-stage engine

SUBJECT AREA: Aerospace, Steam and internal combustion engines

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Harry Ricardo was the eldest child and only son of Halsey Ricardo (architect) and Catherine Rendel (daughter of Alexander Rendel, senior partner in the firm of consulting civil engineers that later became Rendel, Palmer and Tritton). He was educated at Rugby School and at Cambridge. While still at school, he designed and made a steam engine to drive his bicycle, and by the time he went up to Cambridge in 1903 he was a skilled craftsman. At Cambridge, he made a motor cycle powered by a petrol engine of his own design, and with this he won a fuel-consumption competition by covering almost 40 miles (64 km) on a quart (1.14 1) of petrol. This brought him to the attention of Professor Bertram Hopkinson, who invited him to help with research on turbulence and pre-ignition in internal combustion engines. After leaving Cambridge in 1907, he joined his grandfather's firm and became head of the design department for mechanical equipment used in civil engineering. In 1916 he was asked to help with the problem of loading tanks on to railway trucks. He was then given the task of designing and organizing the manufacture of engines for tanks, and the success of this enterprise encouraged him to set up his own establishment at Shoreham, devoted to research on, and design and development of, internal combustion engines.

Leading on from the work with Hopkinson were his discoveries on the suppression of detonation in spark-ignition engines. He noted that the current paraffinic fuels were more prone to detonation than the aromatics, which were being discarded as they did not comply with the existing specifications because of their high specific gravity. He introduced the concepts of "highest useful compression ratio" (HUCR) and "toluene number" for fuel samples burned in a special variable compression-ratio engine. The toluene number was the proportion of toluene in heptane that gave the same HUCR as the fuel sample. Later, toluene was superseded by iso-octane to give the now familiar octane rating. He went on to improve the combustion in side-valve engines by increasing turbulence, shortening the flame path and minimizing the clearance between piston and head by concentrating the combustion space over the valves. By these means, the compression ratio could be increased to that used by overhead-valve engines before detonation intervened. The very hot poppet valve restricted the advancement of all internal combustion engines, so he turned his attention to eliminating it by use of the single sleeve-valve, this being developed with support from the Air Ministry. By the end of the Second World War some 130,000 such aero-engines had been built by Bristol, Napier and Rolls-Royce before the piston aero-engine was superseded by the gas turbine of Whittle. He even contributed to the success of the latter by developing a fuel control system for it.

Concurrent with this was work on the diesel engine. He designed and developed the engine that halved the fuel consumption of London buses. He invented and perfected the "Comet" series of combustion chambers for diesel engines, and the Company was consulted by the vast majority of international internal combustion engine manufacturers. He published and lectured widely and fully deserved his many honours; he was elected FRS in 1929, was President of the Institution of Mechanical Engineers in 1944–5 and was knighted in 1948. This shy and modest, though very determined man was highly regarded by all who came into contact with him. It was said that research into internal combustion engines, his family and boats constituted all that he would wish from life.

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SUBJECT AREA: Land transport, Railways and locomotives, Steam and internal combustion engines

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Orphaned as a child, Hamilton went to work for Southern Pacific Railroad in his teens, and then worked for several other companies. In his spare time he learned mathematics and physics from a retired professor. In 1911 he joined the White Motor Company, makers of road motor vehicles in Denver, Colorado, where he had gone to recuperate from malaria. He remained there until 1922, apart from an eighteenth-month break for war service.

Upon his return from war service, Hamilton found White selling petrol-engined railbuses with mechanical transmission, based on road vehicles, to railways. He noted that they were not robust enough and that the success of petrol railcars with electric transmission, built by General Electric since 1906, was limited as they were complex to drive and maintain. In 1922 Hamilton formed, and became President of, the Electro- Motive Engineering Corporation (later Electro-Motive Corporation) to design and produce petrol-electric rail cars. Needing an engine larger than those used in road vehicles, yet lighter and faster than marine engines, he approached the Win ton Engine Company to develop a suitable engine; in addition, General Electric provided electric transmission with a simplified control system. Using these components, Hamilton arranged for his petrol-electric railcars to be built by the St Louis Car Company, with the first being completed in 1924. It was the beginning of a highly successful series. Fuel costs were lower than for steam trains and initial costs were kept down by using standardized vehicles instead of designing for individual railways. Maintenance costs were minimized because Electro-Motive kept stocks of spare parts and supplied replacement units when necessary. As more powerful, 800 hp (600 kW) railcars were produced, railways tended to use them to haul trailer vehicles, although that practice reduced the fuel saving. By the end of the decade Electro-Motive needed engines more powerful still and therefore had to use cheap fuel. Diesel engines of the period, such as those that Winton had made for some years, were too heavy in relation to their power, and too slow and sluggish for rail use. Their fuel-injection system was erratic and insufficiently robust and Hamilton concluded that a separate injector was needed for each cylinder.

In 1930 Electro-Motive Corporation and Winton were acquired by General Motors in pursuance of their aim to develop a diesel engine suitable for rail traction, with the use of unit fuel injectors; Hamilton retained his position as President. At this time, industrial depression had combined with road and air competition to undermine railway-passenger business, and Ralph Budd, President of the Chicago, Burlington \& Quincy Railroad, thought that traffic could be recovered by way of high-speed, luxury motor trains; hence the Pioneer Zephyr was built for the Burlington. This comprised a 600 hp (450 kW), lightweight, two-stroke, diesel engine developed by General Motors (model 201 A), with electric transmission, that powered a streamlined train of three articulated coaches. This train demonstrated its powers on 26 May 1934 by running non-stop from Denver to Chicago, a distance of 1,015 miles (1,635 km), in 13 hours and 6 minutes, when the fastest steam schedule was 26 hours. Hamilton and Budd were among those on board the train, and it ushered in an era of high-speed diesel trains in the USA. By then Hamilton, with General Motors backing, was planning to use the lightweight engine to power diesel-electric locomotives. Their layout was derived not from steam locomotives, but from the standard American boxcar. The power plant was mounted within the body and powered the bogies, and driver's cabs were at each end. Two 900 hp (670 kW) engines were mounted in a single car to become an 1,800 hp (l,340 kW) locomotive, which could be operated in multiple by a single driver to form a 3,600 hp (2,680 kW) locomotive. To keep costs down, standard locomotives could be mass-produced rather than needing individual designs for each railway, as with steam locomotives. Two units of this type were completed in 1935 and sent on trial throughout much of the USA. They were able to match steam locomotive performance, with considerable economies: fuel costs alone were halved and there was much less wear on the track. In the same year, Electro-Motive began manufacturing diesel-electrie locomotives at La Grange, Illinois, with design modifications: the driver was placed high up above a projecting nose, which improved visibility and provided protection in the event of collision on unguarded level crossings; six-wheeled bogies were introduced, to reduce axle loading and improve stability. The first production passenger locomotives emerged from La Grange in 1937, and by early 1939 seventy units were in service. Meanwhile, improved engines had been developed and were being made at La Grange, and late in 1939 a prototype, four-unit, 5,400 hp (4,000 kW) diesel-electric locomotive for freight trains was produced and sent out on test from coast to coast; production versions appeared late in 1940. After an interval from 1941 to 1943, when Electro-Motive produced diesel engines for military and naval use, locomotive production resumed in quantity in 1944, and within a few years diesel power replaced steam on most railways in the USA.

Hal Hamilton remained President of Electro-Motive Corporation until 1942, when it became a division of General Motors, of which he became Vice-President.

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SUBJECT AREA: Agricultural and food technology, Mechanical, pneumatic and hydraulic engineering

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John Wallis Titt grew up on a farm which had a working post-mill, but at 24 years of age he joined the firm of Wallis, Haslam \& Stevens, agricultural engineers and steam engine builders in Basingstoke. From there he went to the millwrighting firm of Brown \& May of Devizes, where he worked for five years.

In 1872 he founded his own firm in Warminster, where his principal work as an agricultural engineer was on hay and straw elevators. In 1876 he moved his firm to the Woodcock Ironworks, also in Warminster. There he carried on his work as an agricultural engineer, but he also had an iron foundry. By 1884 the firm was installing water pumps on estates around Warminster, and it was about that time that he built his first wind engines. Between 1884 and 1903, when illness forced his retirement, his wind engines were built primarily with adjustable sails. These wind engines, under the trade marks "Woodcock" and "Simplex", consisted of a lattice tower with the sails mounted on a a ring at the top. The sails were turned to face the wind by means of a fantail geared to the ring or by a wooden vane. The important feature lay in the sails, which were made of canvas on a wood-and-iron frame mounted in a ring. The ends of the sail frames were hinged to the sail circumferences. In the middle of the sail a circular strap was attached so that all the frames had the same aspect for a given setting of the bar. The importance lies in the adjustable sails, which gave the wind engine the ability to work in variable winds.

Whilst this was not an original patent of John Wallis Titt, he is known to be the only maker of wind engines in Britain who built his business on this highly efficient form of sail. In design terms it derives from the annular sails of the conventional windmills at Haverhill in Suffolk and Roxwell in Essex. After his retirement, his sons reverted to the production of the fixed-bladed galvanized-iron wind engine.

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   1) Cognitive Processes Truly Exist

   The basic reason for studying cognitive processes has become as clear as the reason for studying anything else: because they are there. Our knowledge of the world must be somehow developed from stimulus input.... Cognitive processes surely exist, so it can hardly be unscientific to study them. (Neisser, 1967, p. 5).

   2) Cognitive Psychologists Construe the Abstract Mechanisms Underlying Behavior

   The task of the cognitive psychologist is a highly inferential one. The cognitive psychologist must proceed from observations of the behavior of humans performing intellectual tasks to conclusions about the abstract mechanisms underlying the behavior. Developing a theory in cognitive psychology is much like developing a model for the working of the engine of a strange new vehicle by driving the vehicle, being unable to open it up to inspect the engine itself....

   It is well understood from the automata theory... that many different mechanisms can generate the same external behavior. (Anderson, 1980, pp. 12, 17)

   3) Cognitive Psychology Does Not Deal with Whole People

   [Cognitive psychology does not] deal with whole people but with a very special and bizarre-almost Frankensteinian-preparation, which consists of a brain attached to two eyes, two ears, and two index fingers. This preparation is only to be found inside small, gloomy cubicles, outside which red lights burn to warn ordinary people away.... It does not feel hungry or tired or inquisitive; it does not think extraneous thoughts or try to understand what is going on. It is, in short, a computer, made in the image of the larger electronic organism that sends it stimuli and records its responses. (Claxton, 1980, p. 13)

   4) Cognitive Psychology Has Not Succeeded in Making a Significant Contribution to the Understanding of the Human Mind

   Cognitive psychology is not getting anywhere; that in spite of our sophisticated methodology, we have not succeeded in making a substantial contribution toward the understanding of the human mind.... A short time ago, the information processing approach to cognition was just beginning. Hopes were high that the analysis of information processing into a series of discrete stages would offer profound insights into human cognition. But in only a few short years the vigor of this approach was spent. It was only natural that hopes that had been so high should sink low. (Glass, Holyoak & Santa, 1979, p. ix)

   5) Cognitive Psychology Seeks to Understand Human Intelligence and Thinking

   Cognitive psychology attempts to understand the nature of human intelligence and how people think. (Anderson, 1980, p. 3)

   6) The Rise of Cognitive Psychology Demonstrates That the Impeccable Peripheralism of Stimulus- Response Theories Could Not Last

   The past few years have witnessed a noticeable increase in interest in an investigation of the cognitive processes.... It has resulted from a recognition of the complex processes that mediate between the classical "stimuli" and "responses" out of which stimulus-response learning theories hoped to fashion a psychology that would by-pass anything smacking of the "mental." The impeccable peripheralism of such theories could not last. One might do well to have a closer look at these intervening "cognitive maps." (Bruner, Goodnow & Austin, 1956, p. vii)

SUBJECT AREA: Agricultural and food technology

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John Ridley was a preacher in his youth, and then became a mill owner before migrating to Australia with his wife and daughters in 1839. Intending to continue his business in the new colony, he took with him a "Grasshopper" overbeam steam-engine made by James Watt, together with milling equipment. Cereal acreages were insufficient for the steam power he had available, and he expanded into saw milling as well as farming 300 acres. Aware of the Adelaide trials of reaping machines, he eventually built a prototype using the same principles as those developed by Wrathall Bull. After a successful trial in 1843 Ridley began the patent procedure in England, although he never completed the project. The agricultural press was highly enthusiastic about his machine, but when trials took place in 1855 the award went to a rival. The development of the stripper enabled a spectacular increase in the cereal acreage planted over the next decade. Ridley left Australia in 1853 and returned to England. He built a number of machines to his design in Leeds; however, these failed to perform in the much damper English climate. All of the machines were exported to South America, anticipating a substantial market to be exploited by Australian manufacturers.

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