Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 234
es a pointer to the proper posi-tion as indicated by the plate on the inner cover (Fig. 17) MUNICIPAL TELEGRAPHS .219 and then pulls the crank located just below the pointer.Thus, if the pointer of box 34 is placed in the secondposition corresponding to ambulance, the mechanismwould transmit 2 dots… … Fig. 18. attendant depresses a key a prearranged number of timesimmediately after receiving the code signal, which actcauses the bell at the signal box to sound accordingly,thereby notifying the patrolman to use the telephone. Numbered keys may be given to responsible citizenswith which they can…
Telegraph
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