File:The fireside university of modern invention, discovery, industry and art for home circle study and entertainment (1902) (14592191570).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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vated railroad of the ancientstyle. The Electricity is carried in a third T rail, and the trol-leys hang from the trucks of the motor car. This system wasexhibited for the first time at the Worlds Fair in the Intra-Mural Railroad, and was successfully installed by the Metro-politan Elevated Railroad of Chicago, a trunk-line with fourbranches. Its power-house, with four high vertical engine-dy-namos, is one of the sights of the city. There has been no delayin the operation of the road, all difficulties having been foreseenand provided for. (See Fig. 18.) What is the Electric Bridge ? It is the invention and design of William Scherzer, civil en-gineer3 and the first installation was over the Chicago River, onthe line of the Metropolitan Electric Elevated, here describedMr. Scherzer patented his device December 26, 1896. The bridgeopens in the middle and each side rises in the air to a vertical po-sition, so that cars cannot run into the river when vessels are 42 THE FIRESIDE UNIVERSITY.
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ELECTRICITY. 43 passing. Each half of the bridge is a rocker, as if two rocking-chairs were tipped far back and together. At one end is a tower,in which is an electric motor. Power from the trolley-rail runsthe motor. The bridge-tender uses a controller, like the deviceson the cars. The bridge opens swiftly, and when it closes itlocks itself. Four trains frequently stand on this structure atonce, and it is treated as one of the strongest places in the right-of-way. The only difficulty that has arisen came from contrac-tion of metals in cold weathei. I think I would like to understand something of PotentialsAccumulators Condensers and more of Plus and Minus ? As to Potentials, we may define the word as meaning thepower or action which a body is capable of putting forth. Theelectricians presuppose the earth itself to be a magnetized body,and any smaller body of matter is at zero when no electricitywill either go into it out of the earth, or out of it into the earth,always allowing that

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