The outlines of physics: an elementary text-book . open circuit cell, although incapable of furnishingstrong currents continuously, must be capable of respond- THE ELECTBIC CURRENT 269 ing when the circuit is closed, without previous prepara-tion, for months at a time. The way in which the necessary conditions are met inthe Le Clanch6 cell, which is a typical form, is as follows: The negative terminal is a rod of zinc. This is immersedin a liquid which acts upon it only when the circuit is closed, in an aqueous solution of ammonium chloride. The positive terminal is of carbon. It is surrou
The outlines of physics: an elementary text-book . open circuit cell, although incapable of furnishingstrong currents continuously, must be capable of respond- THE ELECTBIC CURRENT 269 ing when the circuit is closed, without previous prepara-tion, for months at a time. The way in which the necessary conditions are met inthe Le Clanch6 cell, which is a typical form, is as follows: The negative terminal is a rod of zinc. This is immersedin a liquid which acts upon it only when the circuit is closed, in an aqueous solution of ammonium chloride. The positive terminal is of carbon. It is surroundedwith dioxide of manganese, which acts as a slow depolar-izer. This is sometimes packed into a porous cup togetherwith the carbon; sometimes it is compressed into blocks,as in the figure, which are attached to the carbon by meansof rubber bands. The jar is closed to hinder evaporation. Figure 229 is a sketch of the Le Clanch^ cell. Properties of Closed Circuit Cells. — These cells mustbe capable of furnishing strong currents continuously for.
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectphysics
