. The practical telephone handbook and guide to the telephonic exchange . 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 topwhich join togethera number of theplates. The processof connecting theplates, which is akind of soldering, iscalled Electrolyte used should be a mixture of about 5 parts of distilled water to 1 part of strong sulphuric acid, this mix-ture having a specific gravity of 1*19.
. The practical telephone handbook and guide to the telephonic exchange . 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 topwhich join togethera number of theplates. The processof connecting theplates, which is akind of soldering, iscalled Electrolyte used should be a mixture of about 5 parts of distilled water to 1 part of strong sulphuric acid, this mix-ture having 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 + of a chloride cell when fully charged is 2*5 volts, this gradually falling as current is drawn from the cell; but care must be taken that it does not fall below 1*8 volts, or damage will be done to the cell. Storage cells deteriorate. 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 quality to prevent leakage of current, as shownin Fig. 21b, which shows two batteries. All metal-work, and
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Keywords: ., bookcentury1900, bookdecade1900, booksubjecttelephone, bookyear19
