17B Mr. Hatchett’s Experiments on the various Alloys, 
Table X. ( continued.) 
Quality. 
Weight be- 
fore friction. 
Weight after 
friction. 
Loss. 
Standard silver, unstamped - 
Grains. 
144> So 
Grains. 
1 44 
Grains. 
0,80 
Standard silver, stamped 
147 
146,20 
0,80 
Fine copper, unstai ped - 
164 
164 
— 
Fine copper, stamped 
146,60 
146,40 
0,20 
It would be superfluous to make any remarks upon this ex- 
periment, as the general results of it agree with those made 
with the same apparatus, which have been lately described. 
Mr. Cavendish observes, that if those cases in Table III. are 
selected, in which one of the pieces rubbed was gold made 
standard by copper, then, the effect will be discerned which was 
produced by the friction of different kinds of gold against that 
metal in a solid form : and again, in Table X. may be seen the 
effect which was produced by the friction of different kinds of 
gold, &c. against the same metal, in the form of filings. 
Table XI. 
Quality of the metal. 
Table III. 
Loss per piece. 
Table X. 
Loss per piece. 
Fine gold - 
0,50 
4, 8 5 
Gold with silver - 
0,10 
i,55 
— — silver and copper 
— 
0,05 
— copper - 
0,05 
0,30 
Gold of 18 carats - 
— • 
0,05 
Standard silver - 
8,20 
0,40 
Copper - 
43,30 
— 
