nd a clay wash put on the sides to make the sand_ stick. Long wooden of bottle-neck cores 2 inches in length and % of an cool for four hours, after which the casting is trimmed gate pins are then placed in position, sticking upright inch in diameter, made of a composition of sand, of its roughness… … THE BRASS CASTING INDUSTRY. The top flask is then filled with the moulding sand about 1,800° Fah. to melt the material, which is com- with plumbago to prevent the metal from sticking. posed of 1 part spelter, 2 parts tin and 8 parts copper, and carefully rammed down around the pins, which Brass…
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