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THE AGE OF ARCHIMEDES
Archimedes the first great inventor.--The battle of Syracuse.--Archimedes' principle.--Inventions of the ancient Greeks
THE AGE OF GALILEO
Galileo and the battle for truth.--The pendulum clock.--Galileo's experiment with falling shot.--The telescope.--Galileo's struggle.--Torricelli and the barometer.--Otto von Guericke and the air-pump.--Robert Boyle and the pressure of air and steam.--Pascal and the hydraulic press.--Newton.--Gravitation.--Colors in sunlight
THE EIGHTEENTH CENTURY
James Watt and the steam-engine.--The first steam-engine with a piston.--Newcomen's engine.--Watt's engine.--Horse-power of an engine.--The Leyden jar.--Conductors and insulators.--Two kinds of electric charge.--Franklin's kite experiment.--The lightning-rod.--Galvani and the electric current.--Volta and the electric battery
FARADAY AND THE FIRST DYNAMO
Count Rumford.--Count Rumford's experiment with the cannon.--Davy.--Faraday's electrical discoveries.--Oersted and electromagnetism.--Amp?re.--Arago.--Faraday's first electric motor.--An electric current produced by a magnet.--Detecting and measuring an electric current.--An electric current produced by the magnetic field of another current.--Faraday's dynamo.--A wonderful law of nature
GREAT INVENTIONS OF THE NINETEENTH CENTURY
Electric batteries.--The dry battery.--The storage battery.--The dynamo.--Siemens' dynamo.--The drum armature.--Edison's compound-wound dynamo.--Electric power.--The first electric railway.--Electric lighting.--The telegraph.--Duplex telegraphy.--The telephone.--The phonograph.--Gas-engines.--The steam locomotive.--How a locomotive works.--The turbine
THE TWENTIETH-CENTURY OUTLOOK
Air-ships.--The aeroplane.--How the Wright aeroplane is kept afloat.--Submarines.--Some spinning tops that are useful.--The monorail-car.--Liquid air and the greatest cold.--The electric furnace and the greatest heat.--The wireless telegraph.--The wireless telephone.--Wonders of the alternating current.--X-rays and radium
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