. The medical and surgical uses of electricity. . scent hydrogen then decom-poses the CuSO^, forming sulphuric acid (H^SO Jand a deposit of metallic copper on the copperplate. The construction is as follows: The morerecent forms have a glass vessel into which isplaced a cylinder of copper immersed in a satu-rated solution of copper sulphate. Inside ofthis copper cylinder a porous cup of unglazedearthenware containing a solution of zinc sul-phate, into which is placed a zinc rod amalga-mated. The copper cylinder is arranged at thetop with a shelf, perforated, upon which are pl^aced crystals of
. The medical and surgical uses of electricity. . scent hydrogen then decom-poses the CuSO^, forming sulphuric acid (H^SO Jand a deposit of metallic copper on the copperplate. The construction is as follows: The morerecent forms have a glass vessel into which isplaced a cylinder of copper immersed in a satu-rated solution of copper sulphate. Inside ofthis copper cylinder a porous cup of unglazedearthenware containing a solution of zinc sul-phate, into which is placed a zinc rod amalga-mated. The copper cylinder is arranged at thetop with a shelf, perforated, upon which are pl^aced crystals of copper sul-phate for the purpose of keeping the solution of copper salt saturated. Awell-constructed and thoroughly prepared Daniells battery will remainactive for a long period of time. Chemic Reactions in the Daniell Battery.—The arrow indicates thedirection of the current, and the porous cup or partition by the doublevertical lines. With dilute zinc sulphate, the electrolytic circuit, prior to the first inthe chemic reaction, is as follows:. Fig. Zn ZnSO., ; ZnSO^ CuSO, I CuSO, I Cu After the first step: I ZnSO. ZnSO, II ZnSO, | CuSO, Cu, + , The action taking place is a very simple one. There is a decreaseof metallic zinc and increase of metallic copper. Zinc crowds copper outof the copper sulphate, so that there is a continuous change of CuSO, intoZnSO, by this process of replacement. The electro-motive force of aDaniells battery as ordinarily set up is about volts. Groves —This battery differs from Daniells mainly in the 32 ELECTRO-PHYSICS. substitution of a nitric-acid for a sulphate-of-copper solution, and plati-num for copper, by which increased electro-motive force is obtained. InFig. 22, A represents a glass vessel containing dilute sulphuric acid, Z acylinder of zinc open at both ends, and V an unglazed earthenware vesselpartially filled with nitric acid. P is a plate of platinum, with a cover,C, which rests on the porous vessel when the plat
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1896
