Spon, Ernest, Haldane, Robert, Lock, Charles G. Warnford (Charles George Warnford), 1853-1909 · London ; New York : E. & F.N. Spon · leaf 467
, leaving a mass of " black " GO to 75 per cent. ; but the assays are tin, containing about 60 per cent, of the metal. This is next smelted. always spoken of in the proportions of Smelting. — In this country, smelting 20. For the ordinary size furnace, the charge consists of 20 to 25 cwt. of is… … draught-hole, sometimes opened during and a small quantity of siaKed lime or fiuor-spar, varied according to the pro- the skimming of the charge ; c, a bed portion of silica contained in the ore. of fire-brick, supported on an arch, or on iron bars ; d, the door for charging ; The materials are…
Workshop recipes · Technology · Industrial arts
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