specific Gravity , and comparative Wear of Gold. 169 
that twenty pieces of each kind of gold were plain and smooth, 
but that the others were stamped with the die which has several 
times been mentioned. The two hundred pieces were mingled, 
and were inclosed within the cubic box. 
The following were the qualities of the gold, 
1. Gold of 23 car. 3-I grs. 
2. Gold made standard by silver. 
3. Gold made standard by silver and copper. 
4. Gold made standard by fine Swedish copper. 
5. Gold made standard by equal parts of fine Swedish copper 
and dollar copper. 
Table VII. 
Number of revolutions, 71720. 
Quality. 
Weight be- 
fore friction. 
Weight after 
friction 
Loss. 
Grains. 
Grains. 
Grains. 
1. Gold 23 car. 3^ grs. 20 
pieces, unstamped 
2716,8 
2624 
92,8 
Gold 23 car. 3^ grs. 20 pieces, 
stamped - - 
2691,4 
2595 5 8 
95 . 6 
2. Gold made standard by sil- 
ver, 20 pieces, unstamped 
2719 
2655,5 
® 3>5 
Gold made standard by silver, 
20 pieces, stamped 
2722,6 
2662,5 
60,1 
3. Gold made standard by sil- 
ver and copper, 20 pieces, 
unstamped 
2720 
00 
0 
!>. 
12 
Gold made standard by silver 
and copper, 20 pieces, 
stamped - - 
2724,7 
2713 
11 ’7 
MDCCCIII. Z 
