Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 540
hod ofnumbering is quite clearly shown in Fig. 364. The Bell companiesuse a separate designation plate for the answering jacks, these plates 518 AMERICAN TELEPHONE PRACTICE. being made removable in order that changes may be made in thenumbering. Fig. 365 shows the relations between the answering… … FIG. 365.-RELATION BETWEEN ANSWERING AND MULTIPLE JACKS. lenses in order to give a more brilliant signal. This cut also showswell the mounting of the answering and calling plugs, together withthe ringing and listening keys of each cord circuit. The supervisorylamps are mounted just back of the…
Telephone
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
