File:The practical telephone handbook and guide to the telephonic exchange (1906) (14756230545).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

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( j 4oooQ iooQ ioQ Qio Qioo Qioool--f O t-joooVJ LmooH -io v-;:./ioV- W400>- --toooV- • --- ■ l- -• --BRIDGE T , BRIDGE BRIDGE (TERMINALS Fig. 440.—Plan and Connections of Silvertown Test Set 464 PRACTICAL TELEPHONE HANDBOOK The battery of 36 cells for the latter test, and another of 3 cellsfor the conductivity tests, are connected by flexible cords andplugs to the terminals on the right, whilst the lines, or resistancesto be measured, are connected to the terminals at the top andbottom. The adjustable resistances are arranged in circles,all in the units ring being of 1 ohm, and all in the tens ring 10 ohms each, the resistances being connected by theinsertion of a single plug at each ring. The box also contains a sensitive galvanometer, with -;th,^-th, and TJ^th shunts, and on the left is fitted a plug switchfor the connection of a standard 10,000 ohms resistance for theinsulation constant. The method of making the tests will be readily understoodfrom the previous descript

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