Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . Fig. 81.—Fuller in porous cup with mercury and dilute H2S04, carbon in a bichromate solution. The depolarizer is a bichromate solution which surroundsthe perforated carbon plate located in the bottom ofthe jar. A vertical carbon rod fitssnugly into the tapered hole in thecarbon plate, and extends throughthe cover forming the positive depolarizer, being heavier thanthe electrolyte, remains at thebottom of the jar, and the twoliquids are thus kept separate. Thisdepol
Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . Fig. 81.—Fuller in porous cup with mercury and dilute H2S04, carbon in a bichromate solution. The depolarizer is a bichromate solution which surroundsthe perforated carbon plate located in the bottom ofthe jar. A vertical carbon rod fitssnugly into the tapered hole in thecarbon plate, and extends throughthe cover forming the positive depolarizer, being heavier thanthe electrolyte, remains at thebottom of the jar, and the twoliquids are thus kept separate. Thisdepolarizer is placed on the marketin the form of crystals, known assulpho-chromic salt, made by theaction of sulphuric acid uponchromic acid. When dissolved, itsaction is similar to that of thechromic acid solution. After thecell has been set up with everythingelse in place the crystals are intro-duced into the solution, near the bottom of the jar, throughthe vertical glass tube shown, and slowly dissolve and diffuseover the surface of the carbon plate. When the cell cur-. Fig. 81-A.—Partz Cell. 68 PRACTICAL ELECTRICITY. rent weakens a few tablespoonfuls of the salt introducedthrough the tube will restore the current to its normal cell should remain undisturbed to prevent the solutionfrom mixing. Its E. M. F. is from to 2 volts, and the6 in. x 8 in. size has an internal resistance of about .5 the depolarization is quite effective, the cell may beused on open or closed circuit work. 86. Bunsen and Grove Cells.—These cells are examplesof the two fluid type, in which the solutions are separatedby a porous partition. Bunsens battery has a bar ofcarbon immersed in strong nitric acid contained in a porouscup. This cup is then placed in another vessel containing
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