Appleton's dictionary of machines, mechanics, engine-work, and engineering (1861)
Appleton, firm, publishers, New York. (1852, D. Appleton & Co.) · New York : D. Appleton · leaf 362
ex steel button. The iron ring, which may be roughly made, is used so long as it is not burned, andoften serves for twenty and more successive cupels and smeltings. Each refining, or assay, requires inall cases a fresh cupel. The moistening of the ashes for making the cupel is a delicate operation,… … * Overmanns Metallurgy. 356 CUPEL. ion.
Mechanical engineering
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