Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 886
AMERICAN TELEPHONE PRACTICE. detail in Fig. 631. It consists of a coil of wire, W, wound on a box-wood frame, D, and supported by means of the flat phosphor-bronzefilament, A, from the torsion pin, E. The current is led in bymeans of the torsion pin, E, and suspension wire to the coil; thenceto the… … FIG. 631.—SUSPENSION OF DARSONVAL GALVANOMETER. distance apart to enable the system to swing freely, but when pack-ing for transportation the torsion head may be pressed down untilthe rings above mentioned firmly clamp the coil. In this conditionit will withstand shipment satisfactorily. To the…
Telephone
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