ABRASION OF THE SURFACES OF SOLIDS. 
157 
Table VII. 
Experiments on the Friction of different Metals with the weights increased 
from 14lbs. to 192lbs. 
Weight to be 
moved. 
Weight re- 
quired to 
move it. 
Proportion. 
Weight to 1 
inch of area. 
Weight to be 
moved. 
Weight re- 
quired to 
move it. 
Proportion. 
Weight to 1 
inch of area. 
Length 6 
Brass on Wrought Iron, 
f- inches, Width Area 5.906. 
Cast Iron on Cast Iron. 
Area 6.75. 
lbs. 
lbs. oz. 
lbs. 
OZ. 
lbs. 
lbs. 
OZ. 
lbs. 
OZ. 
14 
2 2 
6.58 
2 
5.9 
14 
2 
4 
6.22 
2 
1.2 
24 
3 11 
6.50 
4 
1.0 
24 
3 
0 
8.00 
3 
8.9 
36 
4 14 
7.38 
6 
1.5 
36 
5 
14 
6.12 
5 
5.3 
48 
6 6 
7-52 
8 
2.0 
48 
7 
10 
6.29 
7 
1.7 
60 
8 0 
7.50 
10 
2.5 
60 
9 
8 
6.31 
8 
14.2 
72 
9 6 
7-68 
12 
3.0 
72 
11 
7 
6.29 
10 
10.6 
84 
10 10 
7.90 
14 
3.5 
84 
13 
5 
6.30 
12 
7.1 
96 
12 9 
7.64 
16 
4.0 
96 
15 
5 
6.27 
14 
3.5 
192 
27 0 
7-11 
32 
8.0 
Soft Steel on Wrought Iron. 
Brass sliding on Steel. 
Area 5.906. 
Area 
5.9. 
lbs. 
lbs. oz. 
lbs. 
oz. 
lbs. 
lbs. 
OZ. 
lbs. 
OZ. 
14 
2 8 
5.60 
2 
5.9 
14 
2 
1 
6.78 
2 
5.9 
24 
4 8 
5.33 
4 
1.0 
24 
3 
8 
6.85 
4 
1.0 
36 
6 13 
5.28 
6 
1.5 
36 
5 
0 
7.20 
6 
1.6 
48 
9 5 
5.15 
8 
2.0 
48 
7 
11 
6.24 
8 
2.1 
60 
12 6 
4.84 
10 
2.5 
60 
9 
11 
6.19 
10 
2.7 
72 
14 13 
4.86 
12 
3.0 
72 
11 
5 
6.36 
12 
3.2 
84 
17 5 
4.85 
14 
3.5 
84 
13 
0 
6.46 
14 
3.7 
96 
19 4 
4.98 
16 
4.0 
96 
15 
0 
6.40 
16 
4.3 
192 
32 8 
5.90 
32 
8.0 
192 
28 
0 
6.85 
32 
8.0 
Brass sliding on Brass. 
Cast Iron on Wrought Iron. 
Area 5.9. 
Area 5.9. 
lbs. 
lbs. oz. 
lbs. 
OZ. 
lbs. 
lbs. 
OZ. 
lbs. 
OZ. 
14 
2 10 
5.33 
2 
5.9 
14 
2 
4 
6.22 
2 
5.9 
24 
3 8 
6.85 
4 
1.0 
24 
4 
2 
5.81 
4 
1.0 
36 
6 5 
5.70 
6 
1.6 
36 
6 
2 
5.87 
6 
1.6 
48 
8 4 
5.81 
8 
2.1 
48 
7 
12 
6.19 
8 
2.1 
60 
10 3 
5.88 
10 
2-7 
60 
9 
8 
6.31 
10 
2.7 
72 
12 0 
6.00 
12 
3.2 
72 
11 
5 
6.36 
12 
3.2 
84 
14 0 
6.00 
14 
3.7 
84 
13 
13 
6.08 
14 
3.7 
96 
16 0 
6.00 
16 
4.3 
96 
17 
0 
5.64 
16 
4.3 
192 
44 8 
4.31 
32 
8.0 
192 
33 
8 
5.73 
32 
8.0 
