The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 126
Fig. 97.—Scale J Fig. 98.—Scale \ turned. Similar switches are made, as 3, 4, 5, 6, etc., pointswitches for special purposes, having a moving arm whichswings round on a centre so as to make contact with thevarious studs. Lightning Arresters and High-Voltage Guards.—As the bell,armature of…
Telephone
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