. American telephone practice . shutter isdown. The small cam surface on the lower portion of the shutter, s,forces the light spring, t, into contact with the pin, t, when theshutter is down, thus accomplishing the above 158 shows diagrammatically the circuits of two lines con- Can /rw Am ?w5 FIG. 158.—CIRCUITS MAGNETO SWITCH-BOARD—NORMAL. nected at the central office to ground through their spring-jacks,/, and annunciators, D. Between these lines is also shown the cir-cuits and apparatus of a pair of plugs, P and P1 with their flexiblecords c and c\ together with the operators tel
. American telephone practice . shutter isdown. The small cam surface on the lower portion of the shutter, s,forces the light spring, t, into contact with the pin, t, when theshutter is down, thus accomplishing the above 158 shows diagrammatically the circuits of two lines con- Can /rw Am ?w5 FIG. 158.—CIRCUITS MAGNETO SWITCH-BOARD—NORMAL. nected at the central office to ground through their spring-jacks,/, and annunciators, D. Between these lines is also shown the cir-cuits and apparatus of a pair of plugs, P and P1 with their flexiblecords c and c\ together with the operators telephone set, 7, themagneto generator, G, and the keys, K1, by which either the talkingapparatus or the calling generator may be put in circuit with theplugs. Considering now the means by which a subscriber may attract theattention of the operator at the central office, reference is made toFig. 159, which, it will be seen, shows the complete apparatus ofone line only, as indicated in Fig. 158. By turning the crank of his tine.
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Keywords: ., boo, bookcentury1900, bookdecade1900, bookidamericantelepho00mill
