cupel

• IX. See p. 91. Experiment_.--Ordinary lead is calcined in a cupel made of cinders or powdered bones; the lead is changed to a cinder which disappears into the cupel, and a button of silver remains Conclusion_.--The lead has vanished; what more natural than the conclusion that it has been transformed into silver? —  The Story of Alchemy and the Beginnings of Chemistry
• The chip is hammered out as thin as paper and weighed on scales so fine and sensitive that if you weigh a two-inch scrap of paper on them and then write your name on the paper with a course, soft pencil and weigh it again, the scales will take marked notice of the addition Then a little lead (also weighed) is rolled up with the flake of silver and the two are melted at a great heat in a small vessel called a cupel, made by compressing bone ashes into a cup-shape in a steel mold. —  Roughing It
• The base metals oxydize and are absorbed with the lead into the pores of the cupel. —  Roughing It
• In the purest gold there is usually some alloy, to dispense with which resort must be had to the cupel. —  Samuel Brohl and Company
• Do you not know what a cupel is? —  Samuel Brohl and Company

Allen's Synonyms and Antonyms