Telegraph engineering; a manual for practicing telegraph engineers and engineering students by Hausmann Erich

Author:Hausmann, Erich. [from old catalog]
Language: eng
Format: epub
Tags: Telegraph
Publisher: New York, D. Van Nostrand company
Published: 1915-03-25T05:00:00+00:00

grouped on several circuits, it is necessary to transmit the signal over all apparatus-house circuits simultaneously. This is accomplished by fire-alarm transmitters, three types of which are illustrated in Figs. 8, 9 and 10.

Fig. 8 represents a spring-driven detachable signal-wheel transmitter with signal wheels that are cut to correspond with those in all the 'fire-alarm boxes of the system. These wheels are orderly arranged on pegs as shown, or,

TELEGRAPH ENGINEERING

if numerous, are placed in accessible drawers. Upon receiving an alarm, the proper signal wheel is selected and placed in position on the mechanism, and then the handle is drawn to start the mechanism and transmit the signal. Fig. 9 shows a Gamewell one-dial four-number adjus-

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