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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 (1902)

United States. War Dept, Anderson, George Lucius, 1849-1934 · Washington, Govt. Print. Off. · leaf 165

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, 1902, leaf 165 — XIII.—TELEGRAPHY. (A) DIAGRAM OF MORSE RELAY TELEGRAPH FORE0:N^G lines (FIG. 163). The main circuit is drawn full; the local circuits, broken. The former lasesthe ground; the local circuits are metallic. The main battery of gravity cellsin series may be at any point of the main circuit, but a half… … Niw York. — 16.5. 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 soimders maytake the place of relays and local circuits; both key and sounder have a…

Electric machinery · Searchlights · Coast defenses

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