specific Gravity , and comparative Wear of Gold. 155 
Table III. ( continued .) 
Quality. 
Weight be- 
fore friction. 
Weight after 
friction. 
Loss. 
Grains. 
Grains. 
Grainsr 
25. Gold with copper 
142 
141,90 
0,10 
2 6. Gold with silver and copper 
137,80 
137,80 
— 
27. Gold 23 car. 3-f grs. 
137,80 
137 * 7 ° 
0,10 
28. Standard silver 
84,10 
84 
0,10 
2 9. Gold 23 car. si grs. - 
138,10 
138,10 
— 
30 Gold with silver 
155 * 4 ° 
1554 ° 
— 
31. Gold 23 car. si grs. - 
137,60 
136,10 
0,50 
32. Gold with copper - 
144,2(0 
144,60* 
— 
33. Gold 23 car. si grs. - 
140,10 
136,30 
3*8° 
34. Gold and copper in equal 
parts - 
IO34O 
1 
101,80 | 
1,60 
35. Gold with silver - 
153 * 4 ° 
153 * 4 ° 
— 
36. Gold reduced by copper to 
18 carats 
121,80 
121,80 
. 
37. Gold with silver 
153 * 4 ° 
151 
2,40 
38 Gold and copper in equal 
parts - 
101,80 
101,60 
0,20 
39. Goid with silver 
152,1° 
152,10 
■ — 
40. Gold with silver and copper 
137,50 
137 * 5 ° 
— 
41. Gold with silver and copper 
1 . 39 * 9 ° 
139 * 9 ° 
— 
42. Gold with iron and copper 
135 * 9 ° 
1.35 80 
0,10 
43. Goid with copper - - 
1 36,90 
125,70 
1 1,20 
44. Gold and copper in equal 
parts - 
103,10 
99 * 9 ° 
3 * 2 ° 
45. Gold with copper 
140 
140 
. — ■ 
4 6. Gold with tin and copper 
i 3 s 
138 
— 
47. Gold with copper, cast in 
sand - 
132,80 
126,30 
6*50 
48. Gold with iron and copper 
133,8° 
1 29,20 
4,60 
49. Goid with copper, cast in 
sand - 
1 
I 136 
136 
50. Gold of 18 carats 
1 125-3° 
125,30 
— 
* In this instance, there was an increase of weight, amounting to 0,40. 
X 2 
