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American telephone practice (1905)

Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 88

An illustration from American telephone practice, 1905, leaf 88
working parts are all containedwithin a two-piece cup, the two parts of which are permanentlyriveted together, as shown at a a, after the transmitter is assembled.By thus permanently closing the cup it is not easy to tamper withthe working parts, which as a result are usually left in their… … 1/ FTG. SO.—DET.-VTL.S OF STROMBERG-CART.SON TRANSMITTER. between them. Against the rear of the metal diaphragm rest twodouble-armed damping springs, these being secured to the rear ofthe case and serving to hold the diaphragm against the front of thecase and also to prevent too great an amplitude…

Telephone

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