specific Gravity , and comparative Wear of Gold. 177 
isinglass; and, after several trials, it was found necessary to 
replace the weights, which had been removed when the pre- 
ceding experiment was made, each separate weight being equal 
to 3 lbs. 8 oz. 12 dts. and 21 grs. 
Table X. 
Number of revolutions, 66 o. 
Quality. 
l 
Weight be- 
fore friction. 
1 
Weight after 
friction. 
Loss. 
Gold 23 car. 3^ grs. unstamped 
Grains. 
288 
Grains. 
278,30 
Grains. 
9 , 7 ° 
Gold 23 car. 3^ grs. stamped 
290,20 
276,40 
13,80 
Gold made standard by silver, 
unstamped 
268,80 
265,70 
3 , 1 ° 
Gold made standard by silver, 
stamped - 
270,20 
264,90 
5 , 3 ° 
Gold made standard by silver 
and copper, unstamped - 
278,90 
278,80 
0,10 
Gold made standard by silver 
and copper, stamped 
281,70 
281,30 
0,40 
Gold made standard by fine 
copper, unstamped 
239,80 
239,20 
0,60 
Gold made standard by fine 
copper, stamped 
261,60 
26l,20 
0,40 
Gold made standard by equal 
parts of fine and dollar cop- 
per, unstamped 
2477 ° 
247 , 3 ° 
0,40 
Gold made standard by equal 
parts of fine and dollar cop- 
per, stamped 
246,4° 
245 , 9 ° 
0,50 
Gold of 18 carats, unstamped 
J 208,80 
208,70 
0,10 
Gold of 18 carats, stamped - 
I 207,90 
207,70 
0,20 
A a 
MDCCCIII. 
