130 Mr. Hatchett's Experiments on the various Alloys , 
stances, 17,927, while that of gold made standard by copper is 
only 17,157, so, according to the relative proportions of these 
two metals, when united in the alloy, the specific gravity of the 
standard gold may vary between the two extremes of 17,927 
and 17,157, although the real quality or value of the standard 
gold remains unchanged ; and indeed, when some allowance is 
also made for small variations arising from other causes, the 
range of the different specific gravities of gold made standard by 
silver and copper, may be considered as nearly extending from 
18 to 17. 
The following Table is intended to show the various Statements 
of different Authors , respecting the specific Gravity of fine and 
of standard Gold. 
Table III, 
Fine gold. 
Specific grav. 
Names of Authors. 
Fine gold 
19,640 
Ward, Cotes, Muss- 
CHENBROEK. 
A medal, esteemed to be 
nearly fine gold 
19,636 
Caswell. 
P 9 > 3 00 ] 
Fine gold 
1 to r 
1 19,4001 
Lewis.* 
• Dr. Lewis asserts, that when he had refined gold to the greatest degree of purity 
which he believed it capable of being brought to, and when the same had been well 
hammered, he, from many trials, found the specific gravity between 19,300 and 
19,400. Phil. Comm, of Arts, p. 41. 
From every circumstance, therefore, it may be concluded, that 19,640, which has 
been stated as the specific gravity of fine gold, by Ward, Cotes, Musschbnbrqek, 
and others, is merely hypothetical. 
