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.

    45/536 (page 35)
    stone dust and a hard brush, then passed through quite a strong solution of binoxide of mercury, and lastly dried with a clean rag before it is put into the bath. The dipping baths are ordinarily held in vessels of glass, stoneware, porcelain, or of any other ceramic compound which resists the corrosion of acids. Com- mon earthenware and that with a lead varnish must be rigorously excluded. The best stoneware we use cornes from Brittany; it is dark red, and entirely unacted upon by the acids. Next corne the stone- wares from Picardy, ]STevers, and Alsace. The dip- ping pots must be rather high than wide, and be furnished with a cover, in order to prevent évapora- tion. Those with ground edges may be covered with a pane of glass. Wide and flaring earthen pans are very good for rinsing. Electroplaters and varnishers ought to be provided with a considérable numberof dipping pots of various sizes and shapes, in order to accommodate the work in hand, and not to be obliged to clean the same pièce in two operations for the need of a suitable vessel. A large hood, communicating with a chimney, and closed with a sliding glass sash, will contain the following apparatus for a complété cleansing opera- tion :— A furnace for cleansing by tire. A pot for first dipping. A pot for old aqua fortis. A pot for aqua fortis and soot. A pot for compound acids for dead lustre. A pot for compound acids for bright lustre. A pot for solution of nitrate of mercury. A pot for acids to dissolve gold from old pièces.