. The American encyclopædia of commerce, manufactures, commercial law, and finance. »• ? manufactures, n. o. p. of * copper, or of which cop- * per is component of chief • value 45percent. * regulus of, and black or « coarse 4 cents per lb. sheathing, 48 inches long, 14 inches wide, weight from 14 to 34 ounces per square foot 45 per cent. sulphate of (blue >itnol) 4 cents per lb. > ISO IS » heeled (!? ig 1(11) toa trmiwa) ,t, situ-,1 I I I /!• or calcining /iirnnr < uid the charge is t! Urge hoppers of plait iron HII thej^e are r I tr m b) m( ms of a pi itt on withdraw
. The American encyclopædia of commerce, manufactures, commercial law, and finance. »• ? manufactures, n. o. p. of * copper, or of which cop- * per is component of chief • value 45percent. * regulus of, and black or « coarse 4 cents per lb. sheathing, 48 inches long, 14 inches wide, weight from 14 to 34 ounces per square foot 45 per cent. sulphate of (blue >itnol) 4 cents per lb. > ISO IS » heeled (!? ig 1(11) toa trmiwa) ,t, situ-,1 I I I /!• or calcining /iirnnr < uid the charge is t! Urge hoppers of plait iron HII thej^e are r I tr m b) m( ms of a pi itt on withdrawing \] 1 I lit t^ t fiiuace, ^ c( iiipo.^ed 1 1 f I f 1 y a rapid slope 1 I / Two «ides of , 1 i illow tht men to I ill time to time; a I iititv of air,which 1 I ite 1 here are, I 1 lunng the roast- ing ni li II II I It II » ill li 11 f. 1 1 1 h the charge canbe rakid out into the n-stritir U Hit lucl is a n ixture ofanthracite nith small bituminous coal lioastmg however, are now very commonly provided with Siemens re-generators, and heated with gas. There can be ditferent kindsof ore mixed together, but none of the fragments are larperthan a nut. The roasting or calcining goes on for Vihours, at a temperature which drives olf much of the siilpliiir.— Melting far Conrie Metal. Roasted ore and a little (. flag,with some kind of flux metal, and antliracite and bituniiiiouscoal as fuel, are thrown into the coarse melting furnace, which ismaintained at a fierce heat. The result of the process is, thatnearly the whole of the C. is collected into a mass called matt,or cmne metal, combined with the residue of the sulphur andiron. — Calcinitig the Coarse Metal. The matt obtained bythe last process is in small brownish fragments, contaioingabout one third their weight of pure C. The calcining of thissubstance docs not differ much from the roasting of the of the sulphur is driven off by this process; the sub-stance is reduced to smal
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Keywords: ., bookcentury1800, bookdecade1880, bookpublisherbostonesteslauriat
