Lessons in elementary physics / by Balfour Stewart.

  • Balfour Stewart
Date:
1895
Catalogue details

Licence: Public Domain Mark

Credit: Lessons in elementary physics / by Balfour Stewart. Source: Wellcome Collection.

    425/502 page 405
    of the outer, are kept of constant strength, while the surface of tlie copper itself is kept bright through the deposition of new particles produced from the decomposition of the sulphate. The reactions taking place in the cell may be represented by the chemical equations : - Zn Zinc i H..SO, Sulphuric Acid CuSOj + Copper Sulphate II., Hydrogen ZnSOj + H., Sulphate + Hydrogen HoSOj + Cu Sulphuric . Arid It is found that a battery of this kind will remain constant for a very long time, especially when, instead of being charged with dilute sulphuric acid, water only, or a solution of zinc sulphate, is used. The form of Daniell battery largely used in the Telegraphic Service of the United Kingdom is shown in Fig. 12717. It consists of a teak box lined with marine glue Fk;. 12‘jti. and divided into a number of compartments or cells by slate partitions. Each cell has a porous partition dividing it into two halves, in which are alternately placed zinc aiul copper plates. Amalgamation of the zinc w;is first practised bv Kemp, who found that zinc so amalgamated is not .-ittackeil bv acid whilethe battery is not in action. He .also lound that with .im.alg.'imated zinc the cuia-ent is both moie regular ;uul more intense than it is with ordinary zinc.
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