Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 725
FIG. 508—TRANSMITTING DEVICE, FRONT VIEW. around, as shown in Fig. 507^ until the finger strikes a stop mountedon the front of the telephone box, as is clearly shown. The dial is … FIG. 609.—TRANSMITTING DEVICE, REAR VIEW. then released and returned to its normal position by a retractilespring, and in so doing the notched wheel within the box causes 704 AMERICAN TELEPHONE PRACTICE. a pair of springs to make a series of contacts, serving to im-part a vertical movement to the…
Telephone
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