Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 547
us logically to the question of cord weights, a typicalform of which is shown in Fig. 374. This consists of a weight com-posed of a hard alloy of lead cast about the lower portion of thebrass punching, in which is secured a pulley through which the cordruns. The weight of these cord weights is, as… … FIG. 374.—COED WEIGHT, account of the obvious disadvantage of subjecting the cord to toogreat strain and to consequent wear. It is thought that there has been no more difficult type of tele-phone apparatus to properly design than that comprising the va-rious ringing and listening keys, by which the…
Telephone
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