File:The fireside university of modern invention, discovery, industry and art for home circle study and entertainment (1902) (14775743971).jpg

Identifier: firesideuniversi01mcgo (find matches)
Title: The fireside university of modern invention, discovery, industry and art for home circle study and entertainment
Year: 1902 (1900s)
Authors: McGovern, John. (from old catalog)
Subjects: Science
Publisher: Chicago, Union pub. house
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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Fig. 17. STATIONARY MOTOR. which rests against springs. On this shaft is a little cog-wheel.Of course the little cog-wheel, going so very fast—so fast, thatyou hear it hum from your car-seat above it,—plays into a sortof clock-work train, and gains all the advantage of leverage inacting on the car-wheel. The springs on the Armature-shaftare there to take up the sudden jerk with which the Armaturewould elsewise begin its work when the current from thetrolley-wire should be sent through the Magnet. Explain the uses of the wires in the street ?Running from the Dynamo in the power-house are greatelectric cables, covered with insulating material At about every
Text Appearing After Image:
ELECTRICITY. 41 eighth telegraph pole in the street, one of these cables is tapped,and the current seeks an outlet in the wire that runs across thestreet. Going across the street, the current finds the trolley-wireand greedily enters that. What are the little wires for that form a net-work over thetrolley-wires ? They are there only to protect telephone wires fiom falling onthe trolley-wires and becoming live wires/ full of danger, fromdeath and fire, to persons and property. In the early days ofthe live wire, in an Eastern city on the Hudson River, a livewire fell on a horse and killed it. A man touched the horseand was killed, and a second man, striving to rescue the firstman, was also killed. Beside all these wires, and the one thatlies in the track, copper plates are buried deep in the ground atcertain distances, and wires run to the plates. The earth itselfgives a current from the plates back to the Dynamo in the powerhouse. What is the Elevated Electric Railroad ? The applicatio

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