The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 151
lder isnow often used, and is very convenient. The solder is madein the form of a tube of 08 inch diameter, the small holethrough it being filled with resin or some other safe flux. The instrument should have been previously set up, andthoroughly tested, before leaving the workshop or test-room.… … Fig. 141a of galvanised iron, about 2 feet square, should be buried in damp ground, and the earth wire connected. An earth connector which is much used in America is shown in Fig. 141a. A tinned copper band is tucked round one side of the brasscradle, passed through theslot in the other side,…
Telephone
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