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Metallurgy (Principal object in fine)

The principal object in fine casting is to have a mould that shall receive a beautiful impression, and at the same time sufficiently adhesive to resist the force of the fluid metal, that shall neither wash nor be injured by the heat. The sand that covers or surrounds the model should be fine, close sand; after removing the mould, the model must be faced with burnt rotten-stone, and covered with loam, each dusted through a bag, and the mould laid down upon it; this facing may be repeated, the mould must be dried and smoked with a torch; in lieu of water, the sand is moistened with a solution of tartar, or the lees of wine, or with cream of tartar. Care must be taken to loosen the band quickly, viz.: loosen the first mould while the second is pouring, etc. On removing the work every particle of the facing should be carefully scraped from the mould and thrown away. Part the moulds with coal and black rosin.

Gilding-metal.