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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 187

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 187 — TELEPHOXY. 13:3 (H) A CEXTllAT^ STATIOX SYSTEM Sometimes required, is shown for—40 line drops, 1 per station, ^4.10 clearing-out drops, B.10 pings with double cords, C.10 listening keys, E, for 10 connections.10 sets ringing kevs, F, for 10 connections. Operators transmitter.Operators… … 176. Central. 2. On this board (fig. 176) ten stations can be put 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. 17G), or P (fig. 178), hastwo insulated metal i)arts, knob and cylmder,…

Electric machinery · Searchlights · Coast defenses

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