The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 139
tionsare shown in Fig.125, in which theloop line, or line-and - earth ter-minals, are shownon the extremeright. The instru-ment is connectedup on the shuntsystem, the cradlespring short - cir-cuiting the speaking circuit when the cradle is pressed down,and short-circuiting the bell when the H.M.T.… … Fig. 120 SUB-STATION INSTRUMENT CONNECTIONS 117 or central energy system of working, which has now becomethe standard method for exchanges, the sub-station instru-ments are of a somewhat simpler character, as the generator
Telephone
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