The silversmith's handbook : containing full instructions for the alloying and working of silver, including the different modes of refining and melting the metal; its solders; the preparation of imitation alloys... (1921)
Gee, George E. (George Edward) · London : Crosby Lockwood and Son · leaf 65
ty in the middle;the hollow should not however be extended more than within i to i^ in. ofthe bottom of the frame,and above the iron bars.The cupel forms thehearth of the furnace wehave spoken of, and ofwhich Fig. 13 is a sec-tional view; it is remov-able, and not a fixture inthe furnace. It must… … THE CUPEL. 33 wedging in its place beneath the arch of thefurnace. The fire should be only very moderate atthe commencement of the operation, and thefurnace slowly raised in temperature, lest thecupel should crack by being too quickly heated.As the temperature increases, if without anyapparent…
Silverwork
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