The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 550
e last few years have been in the wayof central battery working and in the simplification of thecircuits and freeing the speaking line from any of the workingmagnets by arranging that the latter shall be few in numberand all connected as shunts to the main speaking line. Manyother developments have… … f i*ST SELECTOR Fig. 479.—Theoretical Diagram of Trunk Release grams are given which have been taken from one of a longseries of articles on the History of the Automatic Telephone by A. Bessy Smith and published in Telephony of Chicago vf*nc*l C~r r^^iffi •*• |i, . ^ xfi\— i J C*lWH WHIICM j.i#3LL…
Telephone
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