The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 326
in Fig. 303, so that the benefit of thelatter lines, as regards freedom from inductive noises, etc.,would not be lost on connecting the earthed single lines.Their use now, however, is more particularly in connectionwith common-battery exchange working, to enable the batterycurrent to be fed… … & end, separated by an insulating fibre washer, as shown. The 298 PRACTICAL TELEPHONE HANDBOOK outside windings at each end are connected to the insidewindings to form one coil, and the two intermediate windingsto form another, so that all the four coils may be of an
Telephone
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