Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 219
-driven detachable signal-wheel transmitter with signal wheels that are cut to cor-respond with those in all the fire-alarm boxes of the system.These wheels are orderly arranged on pegs as shown, or,. 204 TELEGRAPH ENGINEERING if numerous, are placed in accessible drawers. Uponreceiving an alarm,… … table-speed weight-driven transmitter. The box numberto be transmitted is set on the dial at the front by movingthe four slotted disks relative to each other. The numberof rounds transmitted may be varied by drawing a levertoward the right to the positions marked i, 2, 3 or 4.This movement causes…
Telegraph
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