170 Mr. Hatchett's Experiments on the various Alloys , 
Table VII (continued.) 
Quality. 
Weight be- 
fore friction. I 
1 
Weight after 
friction. 
Loss. 
Grains. 
Grains. 
Grains. 
4. Gold made standard by fine 
Swedish copper, 2c pieces, 
unstamped 
2746 
2728 
18 
Gold made standard by fine 
Swedish copper, 20 pieces, 
stamped 
2738,1 
2718,9 
19,2 
5. Gold made standard by equal 
parts of fine and dollar 
copper, 20 pieces, un- 
stamped - 
2 799>5 
2786,5 
13 
Gold made standard by equal 
parts of fine and dollar 
copper, 20 pieces, stamped 
2802,7 
2790,6 
12,1 
Grains. 
Total weight of the unstamped pieces, before friction, 137c 1 ,3 
Total weight of the stamped pieces, before friction - 13679,5 
Total loss of the unstamped pieces - 199,3 
Total loss of the stamped pieces - 198,7 
The 71720 revolutions of the preceding experiment, were 
performed in 40 hours ; after which, the pieces were taken out, 
as those parts of the hollow cube which were the most exposed 
to friction, were nearly half worn through. 
All the pieces appeared to have suffered more on the edges 
than on the faces ; and those which were stamped had the im- 
pression more or less obliterated or flattened, in proportion 
to their respective degree of ductility, or to the loss which, 
