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Rough′ing-mill.

A lapidary's wheel, used in roughing down the surfaces of gems to make facets. It is of iron, mounted on a vertical axis, and its upper disk is touched with diamond-dust for the harder gems. It is followed by the grinding and polishing mills.

A grinding-mill used by lapidaries, consisting of a small copper disk, with a face turned true and flat and furnished with spicules of diamond imbedded by hammering into the copper.

A similar disk with fine diamond-dust is used for polishing. See lapidary's mill. [1994]

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