ieo Khiv Proofs Jor malivig 



The frafture of thi^ button diftcred little from Nos. 7 and S« 

 and in forging no diflcreilcc could be detetled, which implied 

 a marked diftin6lion as to qualitv. Gram-. 



Exp. XI. Swcdifh iron, in pieces - 101 a 



Kilkenny marble - 2024 grains, 



Stourbridge clay, old pot 2024 grains. 

 This proportion of earth? is 6 to 1 of that prcfcribed 

 by C. Clouet. The mixture was expofed for nearly 

 50 minutes, when I judocd from the degree of heat 

 that the fufion was complete. When cold, I found a 

 large mafs of glafs refting upon a verv pcrfcft fmooth- 

 (kinncd metalhc button, which was found to weigh 989 



.%? Loft in fufion 23 

 equal to ^^th part of the original w-eight. The fraclure was 

 To like that of the former, that they were not eafily diftin- 

 guifliable from each other. The fame fimilarity in point of 

 quality, when forged and put to various tells, was alfo evi- 

 dent. 



The colour of the glafs was as much alike to No, 10 as 

 were the qualities of the refpetlive metallic produ6ls. Grains. 



Exp. Xil. Swedifli iron - - S78 



Kilkenny marble 1755 grains. 

 From the purity of the Kiikcnnv marble I judged it 

 requifite to expol'e this mixture to a very high degree 

 of heat, which continued nearlv one hour. I found 

 a perfect fufion of the lime, and a very fine button of 

 metal. The latter weighed - - 828 



Loft in fufion 50 

 equal to — ^th part of the original weight. The form, 



appearance, and denfity of this button exa£l:ly correfpondcd 

 with that x)f No. g, wlien Italian marble was fufed along 

 with iron. Its fracture was in moft refpeCls fimilar, and the 

 fubfequent trials proved that its quality was alfo the fame. 

 The lofs in metal was greater in this experiment than in 

 No. 9, probably arifing from the iron being lonsrer expofed 

 under a high teinperature before the carbonate, by reafon of 

 exceflRve puritv, entered into fufion. The glafs produced by 

 the fufion of this marble in contaA with iron was of a black 

 colour, and poirefled of no great degree of luftre in fra6lure. 

 "When pounded fmall, it afi^unjcd a ihade of dirty green, 

 differing materially from any of the former. 



I have avoided entering into a detail of the various appear- 

 ances which thcfe three laft: pFoduds aflumcd in forging. 



Their 



