Daniell's Battery (named after the English physicist John Daniell) was a galvanic battery the cells of which were originally constructed in the following way. A tall cylindrical copper vessel was nearly filled with a saturated solution of copper sulphate. A rod of amalgamated zinc was enclosed in a skin or bladder, which was filled with dilute sulphuric acid, and was suspended in the copper cylinder. When the zincrod was connected by a wire with the copper vessel, which itself formed one of the plates of the battery, the current passed, according to common phraseology, from the copper through the wire to the zinc. Instead of the bladder or skin porous earthenware pots were later employed to contain the dilute sulphuric acid in which the zinc was immersed. In improved modifications of Daniell's battery the most important change was that of substituting for the dilute sulphuric acid that surrounded the zinc, solution of zinc sulphate, and in this case the zinc was not amalgamated. By doing away with the sulphuric acid local waste of the zinc was to a great extent prevented, and the solution of sulphate of zinc was used instead of pure water on account of the very high resistance of water impregnated with salts. Research Daniell's Battery
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Research Daniell's Battery
