International Library of Technology · Scranton, International Textbook Co. · leaf 710
ppersulphate. A solu-tion of zinc sulphatecovers the zinc, andon account of thecopper-sulphate so-lution being moredense than theother, the two solu-tions do not mix,hence the namegravity battery.The top solutionshould be drawn offfrom time to timeand water added.If the dividing linebetween the… … Fig. 29. 28 INTERIOR WIRING. 43 on open circuit. These cells will deliver a small, steady cur-rent, but their output is not large and they are rather expen-sive to maintain. The closed-circuit burglar-alarm systemis little used in ordinary work in connection with dwellings.It is usual when…
Electrical engineering
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