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Philippe Lebon, French engineer

Philippe Lebon, French engineer

Gustav Froment, French electrical engineer

Gustav Froment, French electrical engineer

Etienne Lenoir, French engineer

Etienne Lenoir, French engineer

Guillaume Carcel, french inventor

Nikolaus Otto, German engineer

Sebastien Vauban, French military engineer

Sebastien Vauban, French military engineer

Sebastien Vauban, French military engineer

Georges-Auguste Leschot, French watchmaker

Marcel Deprez, French electrical engineer

Karl Etzel, German railway engineer

Karl Etzel, German railway engineer

Charles de Changy, French engineer

Giovanni Caselli, Italian physicist

Rudolph Diesel, German mechanical engineer

Early electric telegraph receiver, 19th Century illustration

Early telegraph printing receiver, 19th C illustration

Jacques-Constantin Perier, French engineer

Jacques-Constantin Perier, French engineer

Pierre-Paul Riquet, French engineer

Francois Sudre, French composer

Francois Sudre, French composer

Claude Chappe, French engineer

19th Century nitroglycerine laboratory, illustration

19th Century nitroglycerine laboratory, illustration

Robert Stirling, Scottish clergyman and inventor

Marc Seguin, French engineer

Georges-Louis Le Sage, Swiss physicist

William Fairbairn, Scottish engineer

William Fairbairn, Scottish engineer

Karl Benz, German engineer

Salomon de Caus, French engineer

Pavel Yablochkov, Russian

Otto petrol engine, 19th century

Campbell petrol engine, illustration

Gardner petrol engine, illustration

Theodose Du Moncel, French physicist

19th Century ice cube machine, illustration

19th Century ice-making machine, illustration

19th Century phosphorous oven, illustration

19th Century ice cube machine, illustration

19th Century ice-making machine, illustration

19th Century phosphorous oven, illustration

19th Century nitroglycerine machine, illustration

19th Century nitroglycerine machine, illustration

Werner Siemens, German electrical engineer

Werner Siemens, German electrical engineer

Werner Siemens, German electrical engineer

Watt's steam engine, historical artwork

Richard Trevithick, British engineer

Jean-Pierre Blanchard, French balloon pioneer

Early electric engine, 19th Century illustration

Robert Stephenson, British engineer

Ernest Petin, French balloonist

Edward Whitehouse, telegraph engineer

Edward Whitehouse, telegraph engineer

Johann Philipp Reis, German inventor

Brouhot petrol engine, illustration

Industrial diesel engine, illustration

Herschel's 40 foot telescope, 19th Century illustration

Ocean liner engine, historical image

Boudreaux-Verdet engine, 1900s

Tessie du Motay, French chemist

Adorne's hot air balloon, 1784

Blanchard's first Channel-crossing balloon, 1785

Early electric telegraph machine, 19th Century illustration

19th Century steam car, illustration

Moritz Hermann von Jacobi, German physicist

Moritz Hermann von Jacobi, German physicist

Jet engine, cutaway artwork

Making nitroglycerine, 19th Century illustration

Making nitroglycerine, 19th Century illustration

Louis Breguet

Carl Von Steinheil, German physicist

Louis Breguet, French physicist

Joseph Louis Proust, French chemist

Joseph Louis Proust, French chemist

Jean-Pierre Blanchard, French balloon pioneer

Gilbert Romme, French politician and mathematician

Gilbert Romme, French politician and mathematician

George Stephenson, British engineer

Brown Bess, British Army musket, illustration

French schooner yacht Velox blueprints, illustration

Vatican Observatory, 19th Century illustration

Proxima Centauri interstellar spacecraft, illustration

George Elkington, British industrialist

George Elkington, British industrialist

Johannes Gutenberg, German printer

19th Century amphibious vehicle, artwork

Montgolfier hydraulic ram, 18th century

Eugene Godard, French aeronaut

Jean Jacques Victor Coste, French biologist

Henri Etienne St Claire Deville, French chemist

Lord Kelvin, British physicist

Lord Kelvin, British physicist

Lord Kelvin, British physicist

Otto von Guericke, German physicist, 19th C illustration

Gas and petrol engine, 1897

Elie de Beaumont, French geologist

Denis Papin, French physicist

General Electric F110-400 jet engine, illustration

Louis-Urbain-Aubert de Tourny, French architect

18th Century camera obscura, artwork

Ancient Egyptian ship, artwork

Vikings, historical artwork

Montgolfier brothers, French balloonists

Francois d'Arlandes, French balloonist

Piston engine and oil, artwork

Piston engine, artwork

Piston engine, artwork

Supercavitating torpedo, illustration

Supercavitating torpedo, illustration

Supercavitating rocket-powered vehicle, illustration

Supercavitating rocket-powered vehicle, illustration

Historical microscope, artwork

Orion and Apollo spacecraft lunar orbits, illustration

Denis Papin, French physicist, artwork

American P-38 Lightning WWII fighter aircraft, illustration

Robert Fulton, US engineer

Robert Fulton, US engineer

Francois Laurent, French aeronaut

Louis Thenard, French chemist

Eugene Flachat, French civil engineer

Moncure Robinson, US civil engineer

Moncure Robinson, US civil engineer

First gas engine, 1860

Otto gas engine, 19th century

Benier gas engine, 19th century

Bisschop gas engine, 19th century

Francois gas engine, 19th century

Charon gas engine, 19th century

Koerting-Lieckfield engine, 19th century

Ravel gas engine, 19th century

Cromwell Varley, English engineer

Cromwell Varley, English engineer

Early 19th-century whaleboat

Joseph Nicephore Niepce, French inventor

Jacques-Louis De Pourtales, Swiss banker

Jacques-Louis De Pourtales, Swiss banker

Felix Wankel, German engineer

Carl Von Steinheil, German physicist

Petrol engine, illustration

Comte de Buffon, French naturalist

Joseph Louis Proust, French chemist

Steam engine valve, 19th century

Brayton carburettor, illustration

Daimler carburettor, illustration

Car engine and magneto, illustration

Balloon engine and magneto, illustration

Reheating hot water tanks, 19th century

Zenobe Gramme, Belgian engineer

15th century ship

Triagoz lighthouse, France, 19th Century

Aime Thome de Gamond, French engineer

19th Century internal combustion engine

Jacquard perforating machine blueprint, illustration

Lathe blueprint, illustration

Sewing machine blueprint, illustration

Sewing machine blueprint, illustration

Windmill, 19th century

Charles and Roberts' hydrogen balloon, 1783

19th Century diving bell, illustration

19th Century diver, illustration

19th Century safety lamps, artwork

Nasmyth's steam hammer, artwork

George Stephenson, British engineer

17th Century rooftop observatories

Compound microscope, 17th Century artwork

Pierre Simons, belgian engineer

Pierre Simons, belgian engineer

Blaise Pascal, French mathematician

Henri de Ruolz, French industrial chemist

Henri de Ruolz, French industrial chemist

Jean Chaffanjon, French explorer

Elevator, London, 1890

Armand-Pierre Seguier, French lawyer

Claude Adrien Helvetius, French philosopher

Guillaume Dupuytren, French surgeon, illustration

Theophile-Jules Pelouze, French Chemist

19th Century Papuan people, illustration

Araucanian man, 19th Century illustration

Cherokee warrior, 19th Century illustration

Native American man, 19th Century illustration

Emile Pereire, French banker and businessman

The four strokes of a four-stroke cycle engine - intake, compression, power, and exhaust. Only the intake stroke delivers power.

Blower-scavenged, two-stroke-cycle engine with uniflow scavenging, displaying both upstroke and downstroke.

The gasoline carburetor is a device that introduces fuel into the airstream as it flows into the engine.

Cross section of a V-type engine.

Diesel engine equipped with a precombustion chamber.

The sequence of events in a four-stroke diesel engine involves a single intake valve, fuel-injection nozzle, and exhaust valve.

Typical gasoline engine lubrication system.

Typical gasoline engine cooling system.

Benjamin Berkeley Hotchkiss, US engineer

James Watt, caricature

Coutelle's military balloon L'Entreprenant, 1790s

Jules Degousee, French engineer

Savery's steam engine pump, 1699 illustration