i6o Mr. Hatchett's Experiments on the various Alloys , 
It has been already observed, that the foregoing experiment 
was similar to that which preceded it, in respect to the quality, 
number, and arrangement of the pieces ; and the only difference 
was, that the pieces employed in the present experiment were 
stamped with the die formerly mentioned. 
As the continuance of the friction was not so long as that of 
the former experiment, it was not found necessary to remove 
any of the pieces, so that the complete series remained in the 
apparatus, during the whole of the experiment. 
It will now be proper to compare the results of these two last 
experiments ; and, in order to do this with more perspicuity, the 
following comparative Table, and some observations upon it, 
have been added. 
Comparative Table, V. 
Number of revolutions, 229040. 
Number of revolutions, 83520. 
Plain or unstamped pieces. 
Stamped pieces. 
Quality. 
Loss. 
Quality. 
Loss. 
Grains. 
Gtains. 
1 
3,0 1 
1 
” 1 
7 6,30 
\ x > 7 ° 
Gold 23 car. 3I grs 
2 
3 , 3 ° J 
Gold 23 car. 3^ grs. 2 
1,70 J gained ,40 
1,30 
3 
— 1 
0,80 1 
Gold made stand, by silver 
> 0,10 
Gold made stand, by silver 
[ 0,90 
4 
0,10 J 
4 
0,10 J 
5 
6,40 j 
5 
0,20 j 
Gold with silver & copper 
\ 9 > 7 ° * 
Gold with silver & copper 
> i,io 
6 
3 - 3 ° J 
6 
0,90 J 
7 
— 1 
0,20 I 
Gold with copper 
> 0,10 
Gold with copper 
l 0,30 
8 
0,10 J 
8 
0,10 J 
9 
17,2° 1 
9 
3,20 ] 
Gold with iron and 
copper 
[31,20 
Gold with iron and copper 
[ S,Z° 
10 
14,0 j 
10 
2,0 J 
1 1 
0,10 1 
1 1 
‘>30 ] 
Standard silver 
- 
> 0,20 
Standard silver 
[ 3 >° 
12 
0,10 J 
12 
1,70 J 
1 i 
to, 10 ] 
13 
44,40 ] 
Copper 
- 
88,80 
Copper 
[ 80,50 
14 
3 8 ,7o J 
! 4 
36,10 J 
* Th considerable diminution of these pieces was caused by an accident, which 
has been mentioned in a former note. 
