152 Mr. Hatchett's Experiments on the various Alloys, 
the pieces remained in the apparatus till the experiment was 
finished. 
Table II. 
Number of revolutions, 20680. 
Quality. 
Weight be- 
fore friction. 
Weight after 
friction 
Loss. 
1. Gold made standard by 
copper - 
Grains. 
846,90 
Grains. 
846,30 
Grains. 
0,60 
2. Gold made standard by 
copper and silver 
834,80 
833,60 
1,20 
3. Gold made standard by 
silver 
94°>3° 
936,80 
3’5° 
4. Standard silver 
518,70 
.515 
3’ 70 
5. Gold 23 car. grs. fine - 
846,40 
841,80 
4,60 
6. Gold reduced to 18 carats 
by copper 
745>8o 
74 1 
4,80. 
7. Gold made standard by 
iron and copper 
825,60 
818 
7,6° 
8. Gold made standard by tin 
and copper 
849,40 
835,60 
13,80 
9. Copper - - - 
49^9° 
450,60 
46,30 
Upon comparing the result of this experiment with that of the 
former, it may in like manner be observed, that gold made 
standard by copper, or by silver and copper, or by silver, suf- 
fered the least by wear ; after which, standard silver, and then 
gold of 23 car. 3^ grs. together with the others enumerated in 
the Table, were progressively more affected ; and as, in the first 
experiment, the greatest loss was sustained by gold alloyed with 
