. Medical electricity; a practical treatise on the applications of electricity to medicine and surgery. the zinc element. 1 The carbon for battery purposes is gas carbon. It is mixed with treacle,put into suitable moulds, and baked in an oven. When its properties are im-paired, they may be almost entirely restored by washing the carbon thoroughlyand subjecting it again to the heat of the oven. 52 ELECTRO-PHYSICS. Around the zinc and covering it is water only. The sul-phate of copper is decomposed, copper is deposited on thecopper rosette, and the sulphuric acid diffuses through toattack the zi
. Medical electricity; a practical treatise on the applications of electricity to medicine and surgery. the zinc element. 1 The carbon for battery purposes is gas carbon. It is mixed with treacle,put into suitable moulds, and baked in an oven. When its properties are im-paired, they may be almost entirely restored by washing the carbon thoroughlyand subjecting it again to the heat of the oven. 52 ELECTRO-PHYSICS. Around the zinc and covering it is water only. The sul-phate of copper is decomposed, copper is deposited on thecopper rosette, and the sulphuric acid diffuses through toattack the zinc (Fig. 24). This form of battery requiresbut little attention. Water is needed every few days tosupply the loss by evaporation, and some crystals of cop-per sulphate must be dropped into the copper solutionoccasionally. The action of this battery is remarkablyconstant, and it will continue so for months, requiring nofurther attention than adding a little water. The actionon the zinc is slight, and the resistance within the batteryabout equal to that of the body—hence the smoothness of Fig. Siemens and Halskes modification ol the Daniell element, as made for section. the current. After the first expense of construction, thereis but little required to keep it in good working the purpose of a permanent battery it is, in the authorsexperience, the best. After many trials and failures, I havefinally adopted this form for office use in my private prac-tice. I he cup should have a capacity not less than twoquarts, and the zincs should be about three inches in height,an inch in thickness, and twelve inches in circumference,less a space of two inches, so that they can be removedwithout disturbing the connections of the copper modification of the Daniell cup, now much em-ployed for telegraphy, is Hills gravity battery (Fig. 25). FORMS OF GALVANIC COMBINATIONS. 53 In this arrangement the copper element consists of a largecopper plate whi
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectro, bookyear1887
