. The medical and surgical uses of electricity. . erious objec-tions to the use of this battery is removed. Groves battery was inventedin 1839. Bunsen^s Double-Fluid Nitric Acid Battery.—This battery is very sim-ilar to Groves. It differs from it only in the substitution of carbon forplatinum. The letter P in Fig. 23 represents a single element, as it ap-pears when ready for use. F is a vessel of glass containing dilute sulphuric acid. Z, a cylinderof amalgamated zinc. V, a porous vessel partly filled with ordinary ni-tric acid; and C, a bar of carbon or coke. The zinc is first placed in theve
. The medical and surgical uses of electricity. . erious objec-tions to the use of this battery is removed. Groves battery was inventedin 1839. Bunsen^s Double-Fluid Nitric Acid Battery.—This battery is very sim-ilar to Groves. It differs from it only in the substitution of carbon forplatinum. The letter P in Fig. 23 represents a single element, as it ap-pears when ready for use. F is a vessel of glass containing dilute sulphuric acid. Z, a cylinderof amalgamated zinc. V, a porous vessel partly filled with ordinary ni-tric acid; and C, a bar of carbon or coke. The zinc is first placed in thevessel F, after which the porous vessel V, into the nitric-acid solution of walkers zinc-carbon battery. 33 which the carbon C has been immersed, is inserted into the zinc binding-screws in and n are respectively the positive and negativepoles. The chemic action in the Bunsen battery is precisely the same asin the Grove. The hydrogen is intercepted by the nitric acid, and is thusprevented from reaching the carbon prism by Fig. 23. Bunsen^s Bichromate Battery (invented in 1843).—I^ ^^^ battery asolution of bichromate of potash or sodium is used in the following pro-portions : Bichromate of potassium or sodium 77 gm. Sulphuric acid, commercial 78 Water 750 Dissolve the bichromate into boiling water: when cold, slowly addthe sulphuric acid. After all is thoroughly cold it is ready for use. An ordinary Bunsen battery maybe setup as follows: In the glassvessel place the amalgamated zinc cylinder, with a solution of dilutesulphuric acid. Place in the centre of the zinc the porous cup containingthe bichromate solution and the carbon prism. Or since both solutionscontain sulphuric acid, the porous cup can be dispensed with and bothzinc and carbon immersed in the same fluid. In this latter case the zincis usually placed between two plates of carbon, and insulated so as to pre-vent local action, also to reduce the internal resistance. The electro-moti
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1896
