Galvanoplastic manipulations : a practical guide for the gold and silver electroplater and the galvanoplastic operator / translated from the French of Alfred Roseleur by A.A. Fesquet.

  • Roseleur, Alfred, -1879.
Date:
1872
Catalogue details

Licence: Public Domain Mark

Credit: Galvanoplastic manipulations : a practical guide for the gold and silver electroplater and the galvanoplastic operator / translated from the French of Alfred Roseleur by A.A. Fesquet. Source: Wellcome Collection.

    28/536 (page 18)
    The operations “by simple immersion,” by which dissolved metals are reduced to their primitive mé- tal] ic State, are due to Chemical affinities alone, and generally simply resuit in very thin layers of the re- duced métal. On the other hand, we may by electro-deposits arrive at two different results :— It may be desired, for instance, to cover a common métal with a layer of another métal which is more jirecious, more resisting, less oxidizable, and with a more pleasing appearance; but this layer, generally, borrows its strength from the underlying métal, as is the case when we gild or silver copper, or when we cover zinc with copper, etc. Or we may intend to reproduce with scrupulous ex- actness a given article by means of a metallic deposit which, after its séparation from the mould, has suffi- cient firmness to be used for the same purpose, and such are the galvanoplastie reproductions of basso- , relievos, medals, etc. We may also wish to impart a metallic hardness to substances without firmness, and retain at the same time nearly their primitive shapes and dimensions, as when we deposit metallic coats upon small statues, flowers, fruits, insects, etc. We shall examine first the thin electro-deposits of gold and silver, as their applications présent a great variety and are of general interest. Note.—We call— Electro-metallurgy, the art of extracting metals in a raerchant- able form (sheets, bars, or ingots), by the aid of electricity, from ores and natural products. Electroplating, the art of covering, by the aid of electricity, one métal with a thin deposit or coat of another métal.