File:The practical telephone handbook and guide to the telephonic exchange (1906) (14733236716).jpg

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

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
R2> Sl3 and S2; the two latter forming the working coilsfor the supervisory relays. The speaking connection throughthe cords and lines is completed through two condensers joinedacross each pair of inductance coils as shown, the action ofthese being as described on page 213. In other respects theconnections are similar to those illustrated in Fig. 243, as isalso the method of shunting in and out of operation of thesupervisory lamps. Cardiff Exchange System.—The equipment consists of ^three-position subscribers sections, each position being fitted for 120subscribers lines, which can be increased to 150 if necessary.477 478 PRACTICAL TELEPHONE HANDBOOK
Text Appearing After Image:
THE BRITISH INSULATED CO.S EXCHANGES 479 The ultimate capacity of the boards is 10,000. The frameworkof the sections is strongly constructed of angle iron faced andfinished off at the front with polished mahogany. The cableshelves are of sheet iron, the one for the multiple cables com-pletely dividing the section and board into upper and lowerfireproof compartments when the sheet-iron shutters are inposition. In the lower compartment of each position is fitted the

Note About Images