The practical telephone handbook and guide to the telephonic exchange (1906) (14776060813)

Identifier: practicaltelepho00pool (find matches)

Title: The practical telephone handbook and guide to the telephonic exchange

Year: 1906 (1900s)

Authors: Poole, Joseph

Subjects: Telephone

Publisher: New York, Macmillan Co.

Contributing Library: Northeastern University, Snell Library

Digitizing Sponsor: Boston Library Consortium Member Libraries

Text Appearing Before Image:

h must always be keptin proper numerical order) are connected. On the other side,wires from the answering-jacks, the calling lamps, and line andcut-off relays, are connected, also arranged in regular numericalorder. With jumper wires, any one set of tabs on one sidemay be connected to any one set on the other side, as on the main distributing-board. It will be easy to see that, as the calling lamp of any line iskept in close proximity to its corresponding answering-jack 282 PRACTICAL TELEPHONE HANDBOOK on the switch-board, it does not matter to the operator whatis the actual number of a calling line so long as the jacks inthe multiple field are kept in strict numerical order, so thatany called-for line may be found at once. This board is also found convenient for connecting to variouspieces of apparatus, such as relays, registers, etc. Fig. 285 gives a plan of a subscribers line circuit in a C.B.Exchange, from which the connections to the distributing Mai™ Trame A Unt Multiple Jacks

Text Appearing After Image:

24V Fig. 285.—Apparatus-Room. Line Connections frames, etc., can be readily traced. This figure should becompared with Fig. 242. The Main Distributing Frame is made up of a strong verticalsupporting frame of angle iron (shown at a in Figs. 286, 287, and288), to which a large number of iron bars, v h, are fitted at rightangles, so as to project on both sides of the supporting frame.On the ends of these bars brass cross-pieces, x, are riveted,and to these the terminal tab strips and arrester strips arescrewed, so as to form horizontal rows on the. h side andvertical rows on the v side. A view of four vertical rows APPARATUS-ROOM 283 >■ - h 1- Ifc ^ >- I- I- H H I- >- e H 1? )- >: R >: ^ >: h h >1 h >j h >! h :>: v >: . i 1 w/T/////////////^mm zmmmmmmmm, Fig. 286.—Scale ft Fig. 287 284 PRACTICAL TELEPHONE HANDBOOK

the practical telephone handbook and guide to the telephonic exchange 1906 book illustrations telephone images from internet archive

1906

Northeastern University, Snell Library

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public domain