Appleton's dictionary of machines, mechanics, engine-work, and engineering (1869)
New York, Appleton · leaf 410
h leads to the stack, and which in the mean time to clear off from the surface of the melted lead some of the scum. i f this furnace is made entirely of ■« which are the refuse ashes from the soap-works, and in this ■ the furnace has an advantage over the English furnace. The floor or hollow… … and dome When the lead is melted, and all ebullition era- 3, the blast is thrown in at the tuyeres nnting the bellows at playing on the surface of the melted metal. At first no litharge is made, buta dirty troth of oxydized metals is raked off, to facilitate which formation of froth, fine charcoal…
Mechanical engineering
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