The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 383
354 PRACTICAL TELEPHONE HANDBOOK coils of from 20 to 40 lbs. in weight; 100-lb. copper wirein coils of from 50 to 125 lbs., and 18 inches in diameter.Tt should not be directly unwound from the coils, or itwould be apt to get into kinks and twists. A kind of wheelbarrow pro-vided with a drum,on… … Fig. 350.—Elevation (Scale £) insulators of the intermediate polesthe line wire running back for a long distance if a span should break. Terminatingis also needed whena covered wire is tobe connected forleading in. Jointing.—For-merly all joints inline wires were com-pleted by soldering,as it was…
Telephone
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