American telephone practice (1905) (14733309566)

Identifier: americantelepho00mill (find matches)

Title: American telephone practice

Year: 1905 (1900s)

Authors: Miller, Kempster B. (from old catalog)

Subjects:

Publisher:

Contributing Library: The Library of Congress

Digitizing Sponsor: The Library of Congress

Text Appearing Before Image:

The actual circuits of such a systemadapted to common battery talking and signaling is shown in Fig. 325- This, as will be seen, employs four ringing keys, 1, 2, 3 and 4, inthe cord circuit, the operation of any one of which will cause thebell of the correspondingly numbered station on the line with whichthe calling plug is connected, to ring. Thus, depressing key, I, willthrow positive pulsations from the generator on the sleeve side, a,of the line, at the same time grounding the tip side, a!. This willcause the bell at station 1 to ring. Similarly any of the other sta-tions may be called up. In order to prevent undue complication of the ringing keys, and tobring about the further advantage of having a party line handled, sofar as the operator is concerned, in exactly the same manner as ifit were an individual line, Mr. F. R. McBerty, of the Western Elec-tric Company, has proposed a very ingenious system, shown in Fig.326. This uses a separate jack on the switch-board for every sub-

Text Appearing After Image:

FIG. 825.-HIBBARD PARTY LINE SYSTEM.436 PARTY LINE SYSTEMS. 437 scriber on the party line; thus, on a four-party line four jacks wouldbe used for each line, instead of one, as in the original Hibbard sys-tem. The arrangement of the subscribers apparatus with respect to theline is the same in all respects as in the system just described, andthe operation of calling central is obvious from the diagram. In connection with the line conductors, a and a are four spring-

american telephone practice 1905 electronic circuit diagrams western electric switchboards book illustrations high resolution images from internet archive library of congress

1905

Library of Congress

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