Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . h holds the other element (carbon)and the exciting mixture. The carbon rodor plate occupies about one-half the spacein the cell, and the space between the carbonand zinc cylinder is tilled with the followingmixture, the proportions being by weight:Oxide of zinc, 1 part ; sal-ammoniac, 1 part;plaster, 3 parts; chloride of zinc, 1 part;water, 2 parts. Dry cells being portable,are very convenient for use where only an intermittentcurrent is required. The E. M. F. is about volts. 94.
Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . h holds the other element (carbon)and the exciting mixture. The carbon rodor plate occupies about one-half the spacein the cell, and the space between the carbonand zinc cylinder is tilled with the followingmixture, the proportions being by weight:Oxide of zinc, 1 part ; sal-ammoniac, 1 part;plaster, 3 parts; chloride of zinc, 1 part;water, 2 parts. Dry cells being portable,are very convenient for use where only an intermittentcurrent is required. The E. M. F. is about volts. 94. Classification of Cells.— Batteries \ 0 J I Secondary. Primary batteries : Classified by f Open circuit cells—(Grenet, Leclanche.) polarization •< Closed circuit cells—(Daniell, Lalande, into ( Fuller.) f Single fluid cells—(Grenet, Leclanche, J Lalande.) j Double fluid cells—(Bunsen, Grove, L Daniell, Fuller.) C Liquid depolarizer—(Grenet type.) Single fluid cells with -j Solid depolarizer—(Leclanche, La- (_ lande.) Double fluid cells with liquid depolarizer—(Bunsen, Grove, Daniell.). Fi2 Dry Cell. Classified byconstructioninto 76 PRACTICAL ELECTRICITY. 95. Chemicals for Cells and Some Chemical Symbols.— Copper Sulphate (blue vitriol), CuS04 Zinc Sulphate (white vitriol), ZnS04 Ammonium Chloride (sal-ammoniac), NH4C1 Bichromate of Soda, Na2Cr207 Bichromate of Potassium, K2Cr207 Chromic Acid, Cr03 Lead Peroxide, Pb02 Caustic Potash, KOH Sulphuric Acid, H2S04 Caustic Soda, NaOH Nitric Acid, HN03 Copper Oxide, CuO Hydrochloric Acid, HC1 Manganese Dioxide, MnO Silver Chloride, AgCl Lead Oxide, PbO Zinc Chloride, ZnCl2 QUESTIONS. 1. Since the hydrogen gas is evolved from the zinc when it isplaced in dilute acid, how do you account for the fact that in a Voltacell when connected to a circuit, the hydrogen gas is evolved at thecopper plate, yet the copper is not attacked by the acid ? 2. Upon what does the E. M. F. of a cell depend? 3. Would you expect a very
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