Photographed at night while sending a message across the Atlantic.
The terrific snapping of the electric discharge is heard by onestanding near the station, but no light is seen. The strange lightgiven out from the network of wires is invisible to the eye, but iscaught by the photographic plate.
THE SAME STATION PHOTOGRAPHED BY DAYLIGHTTHE STORY OF GREAT INVENTIONS
BY
ELMER ELLSWORTH BURNS
Instructor in Physics in theJoseph Medill High School, Chicago
WITH MANY ILLUSTRATIONS
HARPER & BROTHERS PUBLISHERS
NEW YORK AND LONDON
MCMX
Copyright, 1910, by Harper & Brothers
Published November, 1910.
Printed in the United States of America
CONTENTS
CHAPTER I
THE AGE OF ARCHIMEDES
Archimedes the first great inventor.—The battle of Syracuse.—Archimedes'principle.—Inventions of the ancient Greeks Page 1
CHAPTER II
THE AGE OF GALILEO
Galileo and the battle for truth.—The pendulum clock.—Galileo's experimentwith falling shot.—The telescope.—Galileo's struggle.—Torricelliand the barometer.—Otto von Guericke and the air-pump.—RobertBoyle and the pressure of air and steam.—Pascal and thehydraulic press.—Newton.—Gravitation.—Colors in sunlight Page 9
CHAPTER III
THE EIGHTEENTH CENTURY
James Watt and the steam-engine.—The first steam-engine with a piston.—Newcomen'sengine.—Watt's engine.—Horse-power of an engine.—TheLeyden jar.—Conductors and insulators.—Two kinds of electriccharge.—Franklin's kite experiment.—The lightning-rod.—Galvaniand the electric current.—Volta and the electric battery Page 34
CHAPTER IV
FARADAY AND THE FIRST DYNAMO
Count Rumford.—Count Rumford's experiment with the cannon.—Davy.—Faraday'selectrical discoveries.—Oersted and electromagnetism.—Ampère.—Arago.—Faraday'sfirst electric motor.—An electric currentproduced by a magnet.—Detecting and measuring an electric current.—Anelectric current produced by the magnetic field of another current.—Faraday'sdynamo.—A wonderful law of nature Page 55
CHAPTER V
GREAT INVENTIONS OF THE NINETEENTH CENTURY
Electric batteries.—The dry battery.—The storage battery.—The dynamo.—Siemens'
THE AGE OF ARCHIMEDES
Archimedes the first great inventor.—The battle of Syracuse.—Archimedes'principle.—Inventions of the ancient Greeks Page 1
CHAPTER II
THE AGE OF GALILEO
Galileo and the battle for truth.—The pendulum clock.—Galileo's experimentwith falling shot.—The telescope.—Galileo's struggle.—Torricelliand the barometer.—Otto von Guericke and the air-pump.—RobertBoyle and the pressure of air and steam.—Pascal and thehydraulic press.—Newton.—Gravitation.—Colors in sunlight Page 9
CHAPTER III
THE EIGHTEENTH CENTURY
James Watt and the steam-engine.—The first steam-engine with a piston.—Newcomen'sengine.—Watt's engine.—Horse-power of an engine.—TheLeyden jar.—Conductors and insulators.—Two kinds of electriccharge.—Franklin's kite experiment.—The lightning-rod.—Galvaniand the electric current.—Volta and the electric battery Page 34
CHAPTER IV
FARADAY AND THE FIRST DYNAMO
Count Rumford.—Count Rumford's experiment with the cannon.—Davy.—Faraday'selectrical discoveries.—Oersted and electromagnetism.—Ampère.—Arago.—Faraday'sfirst electric motor.—An electric currentproduced by a magnet.—Detecting and measuring an electric current.—Anelectric current produced by the magnetic field of another current.—Faraday'sdynamo.—A wonderful law of nature Page 55
CHAPTER V
GREAT INVENTIONS OF THE NINETEENTH CENTURY
Electric batteries.—The dry battery.—The storage battery.—The dynamo.—Siemens'
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