[ 97 ] 



XX. An Examivation of C. Clouet's new Procefs for 

 making Coji Sleet from Bar Iron by means of the De^ 

 compo/ifion of Carbonic Add, eontimied*.^ By David 

 MusiiET, £fq- of the CalJer Iron Works. 



H, 



OWEVER conclufive the experiments communicated 

 in niv laft appeared, in oppofnion to the theory adopted by 

 the Warifian chemifts, that the decompofition of carbonic 

 acid afforded the fteely principle to iron, I deemed the exa- 

 mination iniperfcft, unlefs experiments were made with va- 

 rious carbonates, and particularly with thofe foreign to this 

 country. With a view therefore to give every degree of juf- 

 tice and candour to the invefiijration, the experiments which 

 follow were carefully and accurately performed. 



Exp. VII. Fufion of the lame fragments of Swedifh iron 

 with equal portions of Italian marble and Stourbridge old 



clay pot. Grains. 



Pieces of Swedifli iron - - 916 



White Italian marble, i-3d 305*3 grs. 

 Stourbridge old clay pot, i-3d 305*3 grs. 

 This is the exaft proportion prcfcribed by Clouet for 

 the formation of his heft cad fteel. From the mixture, 

 I obtained in 40 minutes a very perfect fufion. The 

 metallic button poircilbd a dcnfe fmooth furface, free 

 from pits and honeycombs. It weighed - 897 



Loft in fufion 19 



cfiual to th part of the orisinal wei<;htof the iron. The 



_ 1 4H,V ^ 00 



incumbent glafs was very perfecl, and of a Imooth denfe 

 furface. Its colour was light bottle green, fome (hades 

 purer than the glafs of experiment No. i. afforded with Bal- 

 grochan limeftonc. 



The button now obtained was cut, and broken acrofs an' 

 anvil. Its fra(5lure was regularly gnmulated, of a dark blue 

 grain, very prominent, but pervaded with a dull lead colour 

 betwixt the cryfials. One-half of tliis button was drawn into 

 a linall drilling tool, and hardened with a degree of heat be- 

 yond tliat of common ftcel. The file, at iirlt, met with a 

 (light refinance; but a few firok(^ removed the partial hard- 

 nets, and an uncommon foft iron fucreedcd. Tiiis drill was 

 introduced below a drilling frame loaded with only 7 lbs. 

 upon the end of the lever, 'llic brace was not turned half 

 ■■ V .r th'. former p.irt of this ExHniinntion fee p. 27 gf cur* l*rt Nunilier. 



Vol. XU. G round 



March iSOi!? 

 No. 46. 



