The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 121
working. Fig. 88is a view of such a long-coil ringer. Ericssons Ringer.—Fig. 89 gives a view of another formof ringer, in which a flat permanent magnet, n s, is made toserve as the reciprocating armature. The s pole is pivotedin a recess cut in the soft-iron yoke of the coils, and the Npole… … Fig. 88.—Scale 1
Telephone
Internet Archive · Northeastern University Library · Public Domain Mark 1.0. Free to use for anything.
