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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 184

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 184 — TELEPHONY. 133 (H) A CEXTRAIi STATIOIS^ SYSTEM 1. Sometimes required, is shown for—40 line drops, 1 per station, ^4.10 clearing-ont drops, B.10 plugs with double cords, C.10 listening keys, E, for 10 connections.10 sets ringing keys, F, for 10 connections. Operators transmitter.Operators… … 176. Central. 2. On this board (fig. 176) ten stations can be i)ut in communication with tenothers in pairs at one time, by way of the ten twin wire cords (fig. 178), keptfrom getting tangled by running weights. Plug C (fig. 176), or P (fig. 178), hastwo insulated metal parts, knob and cylinder,…

Electric machinery · Searchlights · Coast defenses

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