The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 365
Fig. 330 Fig. 331 side of the covered wire being thus prevented by a dryportion being preserved in the cup. AERIAL LINE CONSTRUCTION 337 The joint or nib should be turned horizontally for easysoldering, and not vertically, as shown in the figure. Spur Insulator.—This is an insulator of the form…
Telephone
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