The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 473
al form, knownas the Post-Office pattern, and Fig. 418 is a plan of a similarone, showing also the connections for measuring an ordinaryresistance. The ends of resistance-coils underneath are con-nected fco thick brass blocks which, by means of slightly-tapered brass plugs, can be connected… … Fig. 418.—Plan of Wheatstone Bridge by connection below (shown by dotted lines) to o, where itsplits, one path being through the unplugged coils on the right,and through the resistance to be measured x, to terminal e, andthe other path being through the left-hand unplugged coils, andthose unplugged…
Telephone
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