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Diamond Laps or Mills

These are of two kinds, one for grinding and the other for polishing. The grinding mills are copper discs, from an inch to an inch and a half in diameter, into the surface of which diamond powder of various grades has been hammered or rolled. The polishing mills are made of box-wood, vegetable ivory, etc., and the powder is applied to their surfaces in the shape of a paste mixed with olive oil. These mills are useful for cutting or polishing ruby-pallets, and other hard stones, for flattening stones to be used as jewels and for manipulating hard steel.