The practical telephone handbook and guide to the telephonic exchange (1906) (14569411950)

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:

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Text Appearing After Image:

Fig. 26 the negative plates of which are of an altogether differentconstruction. Fig. 27 gives a vertical section of a portion ofone of these exide plates. The paste p p is filled inbetween a series of lead grids or bars, L L, of triangular section,so that the paste runs in a zigzag strip from top to bottom ofthe plate. With this form shrinkage in the paste cannot 44 PRACTICAL TELEPHONE HANDBOOK :•;->?; Fig. 27 affect the contact with the grid, and there is little danger of pieces getting loose and falling out. The separators used are sheets of wood veneer clipped byslit wooden strips, as shown in Fig. 27a. These,fitted between the plates, effectually prevent short-circuiting of the cells, and do not add to the internalresistance as might have been expected. For telephonic purposes the connections at thetops of the plates are made specially short and thick,as overhearing results if there is any appreciableresistance at this point. Bus Bars.—These are the thick bars at the topwh

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1906

Northeastern University, Snell Library

http://commons.wikimedia.org/

public domain