Appleton's dictionary of machines, mechanics, engine-work, and engineering : illustrated with four thousand engravings on wood ; in two volumes (1873)
D. Appleton and Company · New York : D. Appleton and Co. · leaf 410
time to clear off from the surface of the melted lead some of the scum. The cupel of thisfurnace is made entiiely of wood-ashes, which are the refuse ashes from the soap-works, and in thisrespect the furnace has an advantage over the English furnace. The floor or hollow surface of it is wellpounded… … and dome. When the lead is melted, and all ebullition ceases, the blast is thrown in at the tuyeres n nby setting the bellows at playing on the surface of the melted metal. At first no litharge is made, buta dirty froth of oxydized metals is raked off, to facilitate which formation of froth, fine…
Mechanical engineering · Mechanics · Engineering
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