The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 67
ving a specific gravity of 1*19. Various forms of hydro-meter are used for testing the specific gravity, which should never be allowed to fall below 1-15. The chemical changes which take place during discharge formula :— Pb02 + 2H2S04 + Pb = 2PbS04 + 2ELO.The E.M.F. of a chloride cell when fully… … 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…
Telephone
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