. Dental electro-therapeutics. n by thesulphuric acid to form zinc sulphurite and liberate hydrogenions which migrate to the negative element conveyingpositive charges of current, here the current is conductedaway by the carbon, and hydrogen gas collects on the porouspot, the depolarizer (nitric acid) combines with the freehydrogen to form nitric-peroxide and water, and depolarizesthe cell by dispersing the gas bubbles. 60 ELECTRO-PHYSICS The current strength from this cell is greater than anyof the single fluid cells, because of the small resistancewithin the cell by the perfect depolarizatio
. Dental electro-therapeutics. n by thesulphuric acid to form zinc sulphurite and liberate hydrogenions which migrate to the negative element conveyingpositive charges of current, here the current is conductedaway by the carbon, and hydrogen gas collects on the porouspot, the depolarizer (nitric acid) combines with the freehydrogen to form nitric-peroxide and water, and depolarizesthe cell by dispersing the gas bubbles. 60 ELECTRO-PHYSICS The current strength from this cell is greater than anyof the single fluid cells, because of the small resistancewithin the cell by the perfect depolarization; the E. M. about 2 volts, and internal resistance only a fraction ofan ohm, and maximum current strength about 10 amperes. The strong acid electrolyte of this cell soon destroys thezinc element so that this cell is not a lasting one. Thepoisonous fumes of nitrogen peroxide, which are given off inthe process of oxidization is a great objection to this formof cell; it should not be kept in a room with instruments. Fig. 10. Bunsen cell. It produces current for cautery loop or lamp and a batteryof these cells can be used to charge accumulators wherecurrent from the main is not available. The Grove Cell.—This cell has the same construction asthe Bunsen which is a modification of it. The negativeplate in the porous pot is platinum, but owing to the costof this metal, carbon is substituted in the Bunsen cell,otherwise the fluids and their chemical action in the cellare precisely the same. The Daniell Cell.—This cell is constructed with differentvariations of the following principle. The positive element CELLS 61 Fig. 11 is a rod of zinc which is placed in the centre of a porouspot in the centre of the cell, the zinc is immersed in theelectrolyte which is a dilute solution of sulphuric acid orzinc sulphate. The negative element is copper whichforms the inner lining of the cell, the space between it andthe porous pot contains a saturated solution of sulphateof copper, with us
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