in the MaiiufaHure of Crude Irwt. ^t 



ahd to reflore that equilibrium of parts by the proper appli- 

 cation of fuperadded earths, which experiment and obferva* 

 tion have proved to determine a certain quality of iron. 



Thofe works whofe fituation enables them to draw their 

 fupply from fields of iron Hone, impreffed with all the vari- 

 ous characters of mixture, potfefs many advantages which 

 thofe more infulated are frequently deprived of. With equal 

 eale ought the manufaelurer to be able in thefe <:afes to 

 fabricate with certainty a quality of iron capable of forming 

 to advantage the moft minute piece of cafting, or theheavieft 

 piece of ordnance ; at pleafure he might form a quality fit 

 for the forge, or of value in the pig iron market. In fhort, 

 where fuch variety of ores exift, iron of every quality, com- 

 prifing fufibility and ftrength, may at pleafure be manufac- 

 tured, fuited to the many and various wants of a foundry 

 and forge. 



Failing, however, of this univerfal aflbrtment of iron fione, 

 nature has in many places kindly formed a coiripetcnt fub- 

 flitute, in the great variety and quantity of lime fione which 

 are found within eafy reach of the blaH: furnace, poffefling 

 component parts widely different from each other; from a 

 ftate of the greateft purity, to the heavieft alloy of heteroge- 

 neous mixtures; fometimes fo far debafed as not to be juftly 

 appreciated when ranked under the clafs oflime-ftonfis. 



A want of analytical kuov.ledge in the i nanufafturer may 

 often lead to the purchafe of fuch qualities as may be fuper- 

 iluous, from the variety of his ores, or which are diametri- 

 cally oppofile ii* i^ujiily lu iLofe which ought to have been 

 applied. 1 fliall here annex the analyfis of the principal 

 lime-ftones ufed at the Clyde Iron Works, which from their 

 fuperior fituation, having eafy accefs to the caftem orweftern 

 oceans, can at plepfurc draw their fupplics from a greater 

 number of quarters than any other work in Dritain. 



The filence of provincial hiftorians refpecfting the cbnfti- 

 twent parts of various limes is a fecond inducement to fur- 

 zxilh fuch a table^ wbicl^ may enable the hufbandmaa to de- 

 li^ 2 oide 



