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The Metallurgy of Lead: Including Desilverisartion and Cupellation
Недоступно для просмотра - 2018
The Metallurgy of Lead: Including Desilverization and Cupellation (Classic ...
Недоступно для просмотра - 2017
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Стр. 501 - The operation is conducted by two men. One is seated on the floor, with a large flat stone before him, and with a moveable flat stone-stand at his side. His fellow-workman stands beside him with a crucible filled with melted lead, and having poured a certain quantity upon the stone, the other lifts the moveable stone, and dashing it on the fluid lead, presses it out into a flat and thin plate, which he instantly removes from the stone.
Стр. 123 - After observing this phenomenon once or twice, he began to conceive that possibly some difference might be found in the proportions of silver held by the part that crystallized, and the part that remained liquid. Accordingly, he divided a small quantity of lead into two portions, by melting it in a crucible, and allowing it to cool very slowly with constant stirring until a considerable quantity crystallized, as already mentioned ; from which the remainder, while still fluid, was poured...