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Handbook for the use of electricians in the operation and care of electrical machinery and apparatus of the U. S. seacoast defenses .. (1904)

United States. War Dept · Washington, Govt. print. off. · leaf 168

An illustration from Handbook for the use of electricians in the operation and care of electrical machinery and apparatus of the U. S. seacoast defenses .., 1904, leaf 168 — ^- Ll^ f Nsw York. … ^- WASniNiTOft. 163. Diagram of Morse Relay Telegraph for Long Lines. All relays of the same circuit should be alike. Many operators read the relayand dispense with the local circuit. For 5-mile circuits, 20-ohm sounders maytake the place of relays and local circuits; both key and sounder have a…

Electric machinery · Searchlights · Coast defenses

Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.

More pictures from Handbook for the use of electricians in the operation and care of electrical machinery and apparatus of the U. S. seacoast defenses ..

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