iO/j< Mr. Hatchett’s Experiments on the various Alloys , 
Gold alloyed with lead.* Gold alloyed with bismuth. f 
dts. grs. 
Gold - 18 10 
Lead - 1 .14 
Spec. Grav. 
18,080. 
dts. grs. 
f Gold 18 10 ] 
| Bismuth 114 j 
Spec. Grav. 
> 18,038. 
Gold 18 10 ' 
Copper 019 
Lead - 0 19 . 
• 17-765- 
fGold 18 10 'l 
\ Copper 0 19 
L Bismuth 0 19 J 
1 not 
j examined. 
Gold - 18 10 1 
Copper 1 6 
Lead - 0 8 J 
j- 17-312- 
f Gold 18 10 "| 
f Copper 16 
i. Bismuth 0 8 J 
j- 17.303- 
Gold 18 10 1 
Copper 1 10 
Lead - 0 4 J 
j- 17,032. 
f Gold 18 10 1 
\ Copper 1 10 
l Bismuth 0 4 J 
| 16,846. 
Gold 18 10 1 
Copper 1 13! 
Lead - 0 o^- J 
j- 16,627. 
fGold 18 10 "I 
\ Copper 1 13! 
1 Bismuth 0 o^-J 
\ 16,780. 
Gold 18 10 *J 
Copper 1 i3i 
Lead - 0 0^ J 
j- 17.039- 
fGold 18 10 ] 
j Copper 1 13$ 
l Bismuth 0 0^ j 
j- 17.095- 
* Specific gravity of the lead 11,352. 
f Specific gravity of the bismuth 9,822. 
Although the specific gravities of lead and of bismuth are so 
different, yet the effects which these metals produce upon the 
specific gravity of gold, according to their relative proportions, 
must appear very similar, to every one who examines the fore- 
going Table. Moreover, the quality of the gold thus made 
standard by different proportions of lead and bismuth, cor- 
responded with the alterations of specific gravity ; for, in the 
first experiments, or those in which lead in the one case and 
bismuth in the other formed the whole of the alloy, the gold 
was found to be brittle, like glass, and shewed a fine grained 
