ibith vdr'ioUi Kinds of Glafs. 19^ 



tioh. Neither does it appear that the quantity of deficient 

 metal is in the ratio of the quantity of glafs employed. Grains. 

 Equal portions of glafs and iron. Lofs in metal 65'5 

 Ditto ditto Ditto - 85 



Glafs half the weight of iron. Ditto - 85 



Glafs double the weight of iron. Ditto - 58*3 



Average lofs equal to — 57- 



Grains. 



^xp. V. Swedifh iron _ _ - 900 



Flint glafs pounded - 960 grains. 

 This mixture was expofcd to a pretty high heat, which 

 effedled a very perfeCl redii6lion. The glafs was fmooth 

 and dehfe upon the furface. The button of iron - 855 



Loft in fufion 45 

 equal to ^^th part of the original weight of the iron. One- 

 half of this button drew plcafintly into (hape, and formed a 

 found bar, which, when fubjc6led to various trials, indicated 

 none of that want of tenacity defcribed by Clouet, but in every 

 refpe6l refembled the qualities of metal defcribed in my two 

 laft communications. The glafs obtained in this experiment 

 was of a greenifli blue lead colour, a little tranfparent when 

 broken into thin fragments. Beneath the button of iron I 

 found a fmall mafs of revived lead which weighed 135 grains, 



equal to 7-rth part of the weight of the flint glafs. . 



r)Y(5 vj rains* 



iExp. VI. Swcdifli iron - - 55'^'^ 



Flint glafs ;, or 1750 grains. 



The mixture was expof»id for an hour to a violent 



heat. A fufion was obtained, and the button of metal 



weighed - _ 1. _ 3380 



Loft in fufion 130 



equal to — pth part of the original weight of the iron. This 



produft was cut into two pieces, one of which was drawn 

 into a li)lid bar, under a pretty bright red heat. It after- 

 wards ftood hammering, with caution, at a welding heat, but 

 wa« fo completely rcd-fhort that it would not turn at any 

 ftiadc above a faint red. The fratture of this bar, when cold, 

 was partly granulated and partly filky fibrous, of a very light 

 colour. The glals approached more to a pertiedl green than 

 that of No. V; ftill, however, faintlv tinged with a (liade of 

 N 3 ' lead. 



