The electro-therapeutic guide, or, A thousand questions asked and answered . he zinc itself. Pure zinc is not easily corroded bythe acid, but the ordinary cheap commercial article of zinc, isfull of impur-ities, such as iron, arsenic, lead, carbon, etc. These being dissimilar to thezinc, when both are in the acid, we have a closed circuit between the zinc,the impurities, and the electrolyte, in fact many small cells or a battery ofcells, acting on the surface of the zinc. This causes the zinc to corrodefaster and weakens the main current. If the zinc is too impure, a hissingnoise is heard at t
The electro-therapeutic guide, or, A thousand questions asked and answered . he zinc itself. Pure zinc is not easily corroded bythe acid, but the ordinary cheap commercial article of zinc, isfull of impur-ities, such as iron, arsenic, lead, carbon, etc. These being dissimilar to thezinc, when both are in the acid, we have a closed circuit between the zinc,the impurities, and the electrolyte, in fact many small cells or a battery ofcells, acting on the surface of the zinc. This causes the zinc to corrodefaster and weakens the main current. If the zinc is too impure, a hissingnoise is heard at the zinc end of the cell, and violent chemical action occurs,heating the cell and weakening it. How many types of primary cells? Name them. There are five types of primary cells, which are in common use amongphysicians for generating galvanic currents. Those most commonly used are: i, The Ee Clanche; 2, Red acid orbichromate; 3, The paste or so-called dry cell; 4, The chloride of silvercell; 5, The blue stone or crow foot, or gravity cell. 24 THE GUIDE. I : The Le Clanche Cell
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