A supplement to Ures Dictionary of Arts, Manufactures, and Mines, : containing a clear exposition of their principles and practice. . the mouth. The fireplace, it will be observed, is situated at the back, the flamesplaying through the oven and ascending the chimney, which is above the furnace man is represented in /r/. 421 as stirring the ore with a long iron rake. The ore,before it is submitted to theaction of the fire, is thoroughly dried in a circular pit, placedimmediately above the oven, into which it is let down through the opening when it is con-sidered to be ready for calcini
A supplement to Ures Dictionary of Arts, Manufactures, and Mines, : containing a clear exposition of their principles and practice. . the mouth. The fireplace, it will be observed, is situated at the back, the flamesplaying through the oven and ascending the chimney, which is above the furnace man is represented in /r/. 421 as stirring the ore with a long iron rake. The ore,before it is submitted to theaction of the fire, is thoroughly dried in a circular pit, placedimmediately above the oven, into which it is let down through the opening when it is con-sidered to be ready for calcining. Beneath the oven and connected with it by an openingthrough which the ore when sufficiently roasted is made to p:i.«s, is an arched opening about4 feet wide, termed the wrinkle. Here the ore >b collected, whilst another charge is beingplaced in the furnace. About 7 cwt. or 8 cwt. of ore is the quantity usually roasted at one METALLURGY. 745 time. Whilst undergoing this operation, dense fumes of arsenic and sulphur escape withthe smoke from the fire, and pass through large flues, divided into several chambers, {fig. 420. 422,) where the former is collected. The flue is often 70 yards long, and the greatest de-posit of arsenic takes place at about 15 yards from the oven or furnace. Instead of being 422
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Keywords: ., bookcentury1800, bookdecade1860, bookpublishernewyo, bookyear1864
