39* 0" ^^-^ Aif'^y^^S ^f ^''^•^ ^y Tujton. 



profit, unlefs it could be brcught home as ballaft, and deli-* 

 vered in the vicinity of any iron- work at 22s. per ton. The 

 produfls obtained from it in the aflTay furnace, indicate, in 

 an uncommon degree, how very valuable the quality of 

 crude iron would be in the fcale of manufacture, by its ap- 

 plication. 



The Norwegian, Danifh, and Swedlfh ores, found in 

 ■ftrata, refemble, in many points, the Scotch ore of the ifland 

 «f Iflay ; in affaying them a fimllar treatment is necelTary. 

 Some of them are more fufible, and afford Angular qualities 

 of crude iron. When fufed with oxygenating fluxes, the 

 metal produced is uncommonly hard and brittle ; exhibiting 

 a frafture ftudded with brilliant mjrroirs, diverging the ligh^ 

 in fmall radii : even when fluxes are ufed, eapable of con- 

 veying carbonation, the metal exhibits this bright granulated 

 fra£ture in a great degree. One of the ores from the mine 

 of Houban, upon being expofed a confiderable time after 

 reparation, afforded a mafs of pretty good fteel. The pro- 

 portions neceflary to aflay thefe, with accuracy, fo intimately 

 depend upon their richnefs, and the relative proportions of 

 mixture with which the iron is combined, that the fame 

 recipe can feldom be applied to more than one variety. As 

 iron-ftones are more defined, and their treatment prefcribed 

 by more certain rule, a knowledge of them will foon lead to 

 a juft comprehcnfion of the primary ores; a fecond experi- 

 ment, therefore, with any of them, will be fufficient to 

 point out the necefTary proportions for obtaining in the next 

 aflay carbonated crude iron. In one colleftion of Norwe-, 

 gian ores I fcund the following variety :— 



100 100 100 100 100 IQO 



Thi? 



