t)n the Ajfaylng of Ores hy Fujion. 391 



cent ; and the fuperior qualities I have found as rich as 55 

 to 61 per cent. To obtain carbonated crude iron from the 

 richeft varieties of this ore, add to i averdupoife lb. of it 

 7 ounces of dried chalk, 3 of bottle-glafs, and 1 of charcoal. 

 This mixture will produce foft crude iron, pofleffing great 

 ftrength, and an uncommonly large cry-ftallifed grain. The 

 poorer qualities require an additional quantity of calcareous 

 earth, to reftorc the equilibrium loft by the fubftitution of 

 (ilex in place of iron. This ore had a trial in the large way 

 at Clyde Iron Works, but was fouiid to yield had iron with 

 the ufual proportion of fuel. 



" Oppofite in its quality and refults is the beautiful ore cf 

 the ifland of Elba. This, when prefented to a requifite 

 proportion of carbonaceous matter, to take up its oxygen, 

 not only clears itfelf of this hurtful mixture, but alfo takes 

 u"^ a confiderable portion of carbon, which, in fufiqn, be- 

 comes united tp the metal, and conftitutes it perfeftly car- 

 bonated, In experiments with this ore, I found that when 

 2 ounces of it were treated with 0,% oz. chalk, \ oz. bottle- 

 glafs, and i oz. charcoal, the mixture was with difficulty 

 reduced to a white glafs ; which at no time had been fuffi- 

 clently divided to allow a general gravitation to the many 

 globules of beautiful carbonated iron thus feparated. la 

 fufion, therefore, per fe, the metal precipitated becomes 

 greyiih, and, in many Inftances, affords fimllar refults to a. 

 pure calcaremis iron-ftone ; with this principal difference, 

 that It abounds with nearly a double quantity of metal, 

 whofe tendency to become carbonated is no-ways inferior to 

 any iron-ftone of that clafs. A fmooth carbonated regulus 

 will be obtained from this ore, by ufmg the following pro- 

 portions : Ore in a raw flatc, 2 ounces ; chalk, 2 ounces j 

 bottlc-glafs, 1 1 ounce ; and charcoal, -^ ounce. The fcoria 

 rcfultiug from this fufion will be of a light-blue colour, 

 clouded, and variegated like an agate, and very tranfparent. 

 The great diftance of Elba from this countr)' precludes l\it 

 ppfljbiHty of ufing this ore in cur man\ifa£torics with any 

 C c 4 profit^ 



