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Formaldehyde disinfection, 19th century

Sterilization of milk, 19th century

Electric cooking stove, 19th century

Dishwashing machine, 19th century

Mechanical colour test, 19th century

Turbine design, 19th century

Electricity transformer, 19th century

Key-locking nut device, 19th century

Dual-Brabant plough, 19th century

Metallurgical blast furnaces, 1899

Crop sprayer, 19th century

Rotary transformers, 19th century

Canal construction machine, 19th century

Matchstick factory, 19th century

Acetylene production, 19th century

Liquid air experiments, 19th century

Liquid air experiments, 19th century

Formaldehyde molecule, illustration

Formaldehyde molecule, illustration

Formaldehyde molecule, illustration

Formaldehyde molecule, illustration

Formaldehyde molecule, illustration

Formaldehyde molecule, illustration

Industrial gas engine, 19th century

Paper mill industry, 19th century

Gigantism and acromegaly, 19th century

August Wilhelm Hofmann, German chemist

August Wilhelm Hofmann, German chemist

Peugeot Phaeton automobile, 1894

Carpet weaving in Turkey, 19th century

Carpet weaving in Kurdistan, 19th century

Amber industry, early 20th century

Paul Vieille, French chemist

Bearded lady, 19th century

Repairing submarine telegraph cable, 1894

Alvan Clark and Yerkes 40-inch lens, 1897

Railway bridge construction, Mali, 1898

Railway mailbox mechanism, 19th century

Hydroelectric power, 19th century

Public transformer station, 19th century

Iron ore crusher, 19th century

Resuscitation apparatus, 19th century

Pierre Germain, French inventor

Rotary reading wheel, 19th century

Eiffel Tower's electric lamp, 1889

Fluoroscopy experiment, 1898

Kneipp hydrotherapy consultation, 1895

Electroplating apparatus, 19th century

Central telephone exchange, 19th century

Telephone switchboard, 19th century

Telephone switchboard, 19th century

Food safety tests, 19th century

Baudot telegraph system, 19th century illustration

Eiffel Tower's searchlights, 1889

Early refrigerator, 19th century

Sulphite process for wood pulp, 1898

Conjoined twins, early 20th century

Spinning hemp, 19th century

Derailed train, 19th century

Steel industry furnace, 19th century

Waste incinerator, early 20th century

Liquid air experiments, 19th century

J-L. Dutreuil de Rhins, French explorer

Eleuthere Mascart, French physicist

Hermann von Helmholtz, German physicist

Louis Figuier, French science writer

Joseph Boussinesq, French physicist

Henri Coudreau, French explorer

Anthracite coal industry, 19th century

Jean-Baptiste Marchand, French explorer

Juggling tricks, 19th century

Polynesian canoes, 19th century

Balata rubber tree, 19th century

Marchand expedition across Africa, 1890s

Caving in Switzerland, 19th century

Diamond mine security, early 20th century

Formaldehyde organic compound molecule

Formaldehyde organic compound molecule

Zoology lesson, 19th century

Moissan furnace, 19th century

Electric lights at night, 19th century

Alcoholism research, 19th century

Thomson telegraph recorder, 19th century

Hughes printing telegraph, 19th century

Morse telegraph receiver, 19th century

Gramme dynamo, 1870s

Jeantaud speed controller, 19th century

Richard anemometer, 19th century

Gas engine piston, illustration

Brayton carburettor, illustration

Daimler carburettor, illustration

Paddle water wheel, illustration

Bucket water wheel, illustration

Water wheels at Marly, 1850s

Hercule-Progres turbine, illustration

Campbell petrol engine, illustration

Gardner petrol engine, illustration

Brouhot petrol engine, illustration

Hercule-Progres turbine, 1890s

Hauksbee electrostatic generator, 1709

Holtz electrostatic generator, 1865

Lightning rods, 19th century

Volta's 'Crown of Cups' battery, 1800

Electromagnetic needle effect, 1820

Chromic acid battery, 19th century

Camacho cascade battery, 1870s

Batteries connected in series

Plante accumulator battery, 1859

Heinz lead-acid battery, 19th century

Thomson galvanometer, 1850s

Deprez-d'Arsonval galvanometer, 1882

Ammeter and shunt, 19th century

Ammeter and recorder, 19th century

Voltmeter recorder, 19th century

Decade resistance box, 19th century

Ohmmeter, 19th century

Electricity meter, 19th century

Meritens magneto generator, 1870s

Gramme dynamo, 1870s

Gramme dynamo armature, 1870s

Gramme dynamo, 1870s

Siemens dynamo, 19th century

Multipolar dynamo, 1900s

Siemens dynamo, 1900s

Electrical generators, 1900s

Electric spark displays, 1850s

Geissler tube, 1850s

Tesla high-frequency condenser, 1890s

Electricity transformer, 1900s

Lightning arrester, 1900s

Lightning arrester, 1900s

Carbon electric arc lamp, 1800s

Gramme arc lamp regulator, 19th century

Lighthouse electric light, 19th century

Overhead train power lines, 19th century

Roman beacon tower

Hooke telegraph system, 1684

Chappe telegraph system, 1790s

Optical telegraphy, 19th century

Optical telegraphy, 19th century

Heliograph, 19th century

Pneumatic messaging, 19th century

Steinheil telegraph, 1830s

First Morse telegraph, 1837

Foy-Breguet telegraph, 19th century

Morse telegraph receiver, 19th century

Hughes printing telegraph, 19th century

Bonelli telegraph, 19th century

Caselli pantelegraph, 19th century

Telegraph tape transmitter, 19th century

Stenotelegraph, 19th century

Submarine telegraph cable, 19th century

Submarine telegraph cable, 19th century

Telegraph galvanometer, 19th century

Thomson telegraph recorder, 19th century

Bell telephone, 19th century

Ader telephone station, 19th century

Mining order telegraph, 19th century

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

Samuel Morse, US inventor

Samuel Morse, US inventor

Lightning conductor umbrella, 1770s

Trevithick steam car, 19th century

Stephenson's Rocket, 1829

Serpollet steam car, 19th century

Dion steam carriage, 19th century

Philippe Lebon, French engineer

Etienne Lenoir, French engineer

Nikolaus Otto, German engineer

Pennsylvania oil rush, 1860s

Windmill, 19th century

Mercury orbit hypotheses, 19th century

Eclipsing binary star diagrams, 1895

Sisymbrium flowering plant, 19th century

Anabasis aphylla, 19th century

Phthalaldehyde disinfectant molecule, illustration

Phthalaldehyde disinfectant molecule, illustration

Phthalaldehyde disinfectant molecule, illustration

Phthalaldehyde disinfectant molecule, illustration

Altretamine cancer drug molecule

Altretamine cancer drug molecule

Altretamine cancer drug molecule

Altretamine cancer drug molecule

Fluoroscopy experiment, 1898

Statue of Nicolas de Condorcet, 1894

Thaler sensory illusion, 19th century

Mont Blanc first ascent monument, 1887

German military airship, 19th century

Marble quarry, 19th century

Crossing a river in Vietnam, 19th century

Opium farming in Persia, 19th century

Nuraghe Losa, Sardinia, 19th century

Giant water lilies, 19th century