The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 68
Fig. 27aare shown by the following BATTERIES 45 if allowed to stand without doing work for a length of time,and especially so if not fully charged. They remain in thebest condition when regularly charged and discharged. The cells should be supported on glass or porcelain insulatorsof the best… … Fig. 27& even woodwork, in the battery room should be protected fromthe acid fumes by some anti-acid paint or varnish. The Arrangement of Cells.—When a battery consists of anumber of cells, they may be arranged in several differentways; for example, a battery of 12 cells may be arranged allin…
Telephone
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