The Dental record . s a current of greater volume andconstancy than that furnished by the ordinar)- voltaic batteries. Thecells are arranged for a single fluid, and when in action are placedupon steps, in order that the solution may flow from the upper cellthrough each successive cell by gravitation to a reservoir at the top and bottom reservoirs are of equal capacity, and are fittedwith laps, by which the flow of the solution is regulated and drawn off. Fig. 19 shovs a sectional diawing of this battery, which consists of 104 THE DENTAL RECORD. two carbon plates, the pores of which
The Dental record . s a current of greater volume andconstancy than that furnished by the ordinar)- voltaic batteries. Thecells are arranged for a single fluid, and when in action are placedupon steps, in order that the solution may flow from the upper cellthrough each successive cell by gravitation to a reservoir at the top and bottom reservoirs are of equal capacity, and are fittedwith laps, by which the flow of the solution is regulated and drawn off. Fig. 19 shovs a sectional diawing of this battery, which consists of 104 THE DENTAL RECORD. two carbon plates, the pores of which are charged with paraffin,suspended above a number of fragments of amalgamated zinc. Acopper wire, covered with gutta-percha, except where immersed inthe fragments of amalgamated zinc, passes down to the bottom of thecell where it is in contact with the zinc. The cells are seven inchesdeep by six inches wide, and contain about a quart of solution inaddition to the plates. The absence or exhaustion of the zinc in any. FIC 13. one cell in a battery is indicated by the appearance of a red insolublechromic salt of mercury in a finely divided state, floating in the faultycell. It is then necessary to drop in some pieces of zinc. Thecondition of the zinc may also be ascertained by feeling about thebottom of the cells with a stick. When not in use, the battery may bewashed by simply charging the top reservoir with water, and leavingit to circulate through the cells in the usual manner, having previouslywithdrawn the exciting solution, which may be done by means of thetap or by a siphon. This battery was first employed for the purpose of utilising wastesolutions from bichromate batteries, a quantity of which is thrownaway before having been completely exhausted. This waste isunavoidable, in consequence of the impossibility of permitting suchbatteries, when employed for telegraphic purposes, to run until com-plete exhaustion of the solutions has been effected, therefore somevaluable che
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Keywords: ., bookcentury1800, bookdecade1880, bookpublisherlondon, bookyear188
