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Another (Best method of preparing gold)

The best method of preparing gold in an open clean crucible, and continuing the evaporated; at the same time constantly stirring strong heat until the whole of the mercury is the amalgam with a glass rod. When the merpowder is to be ground in a Wedgwood mortar, cury has completely left the gold, the remaining with a little water, and afterwards dried. It is then fit for use. here given, the operator cannot be too much re- Although the last mode of operating has been minded of the danger attending the sublimation of mercury. In the small way here described, it is fore better to prepare it according to the former impossible to operate without danger; it is thereimpossible to operate without danger; it is theredirections, than to risk the health by the latter.

To Cover Bars of Copper, etc.. with Gold, 80 as to into Sheets.

Turner of Birmingham. Mr. Turner first pre- This method of gilding was invented by Mr. pares ingots or pieces of copper or brass, in convenient lengths and sizes. He then cleans them from impurity, and makes their surfaces level, and Immerse a very clean bright piece of copper in a diluted solution of nitrate of mercury. By the affinity of copper for nitric acid, the mercury will be precipitated; now spread the amalgam of gold rather thinly over the coat of mercury just given to the copper.

This coat unites with the amal- | prepares plates of pure gold, or gold mixed with