Inside Out Library · Explore

A rudimentary treatise on the metallurgy of silver and lead .. (1861)

Lamborn, Robert H · London, J. Weale · leaf 175

An illustration from A rudimentary treatise on the metallurgy of silver and lead .., 1861, leaf 175 — 163 ENGLISH METHOD OF CUPELLING. drawn from beneath the vault when desired. The wind is thrown in through a nozzle at w. The con¬ struction of the cupel or hearth may be understood by a reference to fig. 70, which gives a plan, and fig. 71 … work of iron bars across the bottom, as shown by the dotted lines in fig. 71. This iron periphery is known as the test ring . In order to prepare the cupel, this frame is beaten full of finely^powdered bone-ash that has been moistened with water in which a small quantity of the carbonate of potash…

Silver · Lead

Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.

More pictures from A rudimentary treatise on the metallurgy of silver and lead ..

More like this