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precious metals, commonly made of bone ashes (phosphate of lime). [Written also coppel.] Cupel dust, powder used in purifying metals.

The act or process of refining gold or silver, etc., in a cupel.

ettled (with some one). -- Bone ash, the residue from calcined bones; -- used for making cupels, and for cleaning jewelry. -- Bone black (Chem.), the black, carbonaceous substance into which bones are converted by calcination in close vessels; -- called also animal charcoal. It is used as a decolorizing material in f…

A globule of metal remaining onan assay cupel or in a crucible, after fusion. Button hook, a hook for catching a button and drawing it through a buttonhole, as in buttoning boots and gloves. -- Button shell (Zoöl.), a small, univalve marine shell of the genus Rotella. -- Button snakeroot. (Bot.) (a) The American comp…

See Cupel.

Cupel dust. [Obs.] Powder of steel, or copple dust. Bacon.

Having or bearing cupeles; cupuliferous.

o protect objects heated from the direct action of the fire, as in scorification of ores, cupellation of ore buttons, etc.

A cupel or cupelling hearth in which precious metals are melted for trial and refinement. Our ingots, tests, and many mo. Chaucer.

The operation of refining gold or silver in a test, or cupel; cupellation. Testing machine (Engin.), a machine used in the determination of the strength of materials, as iron, stone, etc., and their behavior under strains of various kinds, as elongation, bending, crushing, etc.