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

Poole, Joseph · New York, Macmillan Co. · leaf 57

An illustration from The practical telephone handbook and guide to the telephonic exchange, 1906, leaf 57 — nd six cylin-drical agglomerate blocks,completely protecting thecarbon from direct ac-tion. With it may beused a cylindrical zincsurrounding the blocks,thus very materially re-ducing the internal resistance of the cell, which is usuallyless than 0*5 ohm. The expectation that these agglomerate cells… … Fig. 18 BA TTERIES 35 DRY CELLS.—Within the last few years various forms ofwhat are known as dry cells have come extensively into use.Those mostly used for telephonic purposes, such as the Helle-sen, the E.C.C., the Obach,the Delafon, etc., are allmodifications of the Leclanche cell, inasmuch as…

Telephone

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