Elementary telegraphy : a manual for students; written specially to meet the requirements of the ordinary grade of the subject as published in the syllabus of the city and guilds of London Institute (1910)
Pendry, H. W. (Henry Walter) · London ; New York : Whittaker & Co. · leaf 43
O^ is known as the depolarizer. The zinc is in theform of a thick plate and is gradually dissolved in thezinc sulphate solution, forming more zinc sulphate, tillthe solution becomes concentrated and crystals are de-posited. When this occurs the crystals must be removed,a portion of the liquid drawn… … Fig. !.—Daniell Battery. especially when the cell is not being worked. One resultis that copper becomes deposited on the zinc plate in theform of black mud, and when this appears the cell must bewashed ovit and renewed. The action of Daniell cell set up as above can berepresented thus : — Cu Zn +…
Telegraph
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