The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 66
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…
Telephone
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