American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 571
hese attachments they have not been shown in the fig-ure. The employment of the non-interfering signal boxes referred to practically pre-vents confusion of signals on any of the circuits, since, while an alarm is in progressover a circuit, (whether emanating from a box on that circuit, or from a… … FIG. 345.—TOWER BELL AND ELECTRO MECHANICAL STRIKLNG APPARATUS. FIRE ALARM TELEGRAPHY. 46I TOWER BELL ELECTRO MECHANISM. The tower bell striking mechanism and electio-mechanical starting devices areillustrated in Fig. 345. In the normal position of the apparatus the hammer h of the bell is as shown…
Telegraph
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