158 
MR, RENNIE’S EXPERIMENTS ON THE FRICTION AND 
Experiments on the Friction of different Metals with the weights increased 
from 14lbs. to 192lbs. 
Weight to be 
moved. 
Weight re- 
quired to 
Proportion. 
Weight to 1 
inch of area. 
Weight to be 
moved. 
Weight re- 
quired to 
Proportion. 
Weight to 1 
inch of area. 
move it. 
move it. 
Cast Iron slidin 
g on Soft Steel. 
Tin slidin 
g on Tin. 
Area 5.9. 
Area 
5.9. 
lbs. 
lbs. 
OZ. 
lbs. 
OZ. 
lbs. 
lbs 
OZ. 
lbs. 
OZ. 
14 
2 
2 
6,59 
2 
5.9 
14 
3 
10 
3.86 
2 
5.9 
24 
3 
10 
6.62 
4 
1.0 
24 
7 
8 
3.20 
4 
1.0 
36 
5 
7 
6.62 
6 
1.6 
36 
9 
8 
3.78 
6 
1.6 
48 
7 
2 
6.73 
8 
2.1 
48 
12 
13 
3.74 
8 
2.1 
60 
9 
8 
6.31 
10 
2.7 
60 
17 
7 
3.44 
10 
2.7 
72 
11 
9 
6.22 
12 
3.2 
72 
22 
2 
3.25 
12 
3.2 
84 
13 
9 
6.19 
14 
3.7 
84 
28 
8 
2.94 
14 
3.7 
96 
15 
5 
6.2 6 
16 
4.3 
96 
36 
0 
2.66 
16 
4.3 
192 
32 
0 
6.00 
32 
8.0 
192 
66 
8 
2.88 
32 
8.0 
Soft Steel on Soft Steel. 
Cast Iron on 
Hard Brass. 
Area 5.9. 
Area 7.75. 
lbs. 
lbs. 
OZ. 
lbs. 
OZ. 
lbs. 
lbs. 
OZ. 
lbs. 
OZ. 
14 
2 
0 
7.00 
2 
5.9 
14 
1 
11 
8.29 
1 
12.9 
24 
3 
7 
6.98 
4 
1.0 
24 
4 
0 
6.00 
3 
1.5 
36 
5 
4 
6.85 
6 
1.6 
36 
6 
0 
6.00 
4 
10.3 
48 
6 
13 
7-04 
8 
2.1 
48 
7 
13 
6.14 
6 
3.0 
60 
8 
11 
6.90 
10 
2.7 
60 
9 
0 
6.66 
7 
11.8 
72 
10 
5 
6.98 
12 
3.2 
72 
11 
0 
6.54 
9 
4.6 
84 
12 
2 
6.92 
14 
3.7 
84 
13 
2 
6.40 
10 
13.4 
96 
13 
12 
6.98 
16 
4.3 
96 
14 
8 
6.62 
12 
6.1 
192 
31 
8 
6.09 
32 
8.0 
Wrought Iron on 
Wrought Iron. 
Brass on Cast Iron. 
Area 5.9. 
Area 6.75. 
lbs. 
lbs. 
OZ. 
lbs. 
OZ. 
lbs. 
lbs. 
OZ. 
lbs. 
OZ. 
14 
2 
1 
6.78 
2 
5.9 
14 
2 
1 
6.78 
2 
1.2 
24 
3 
13 
6.29 
4 
1.0 
24 
3 
8 
6.85 
3 
8.9 
36 
5 
12 
6.26 
6 
1.6 
36 
5 
1 
7-11 
5 
5.3 
48 
7 
2 
6.73 
8 
2.1 
48 
6 
10 
7-24 
7 
1.7 
60 
9 
8 
6.31 
10 
2.7 
60 
9 
3 
6.53 
8 
14.2 
72 
11 
6 
6.32 
12 
3.2 
72 
10 
5 
6.98 
10 
10.6 
84 
12 
15 
6.49 
14 
3.7 
84 
13 
12 
6.10 
12 
7.1 
96 
14 
3 
6.76 
16 
4.3 
96 
15 
1 
6.37 
14 
3.5 
192 
27 
0 
7.11 
32 
8.0 
Tin sliding on Wrought Iron. 
Tin sliding on Cast Iron. 
Area 
5.9. 
Area 6.75. 
lbs. 
lbs. 
OZ. 
lbs. 
OZ. 
lbs. 
lbs. 
OZ. 
lbs. 
OZ. 
14 
2 
10 
5.33 
2 
5.9 
14 
2 
12 
5.09 
2 
1.2 
24 
4 
6 
5.48 
4 
1.0 
24 
4 
8 
5.33 
3 
8.9 
36 
6 
8 
5.53 
6 
1.6 
36 
6 
7 
5.59 
5 
5.3 
48 
7 
14 
6.09 
8 
2.1 
48 
8 
14 
5.40 
7 
1.7 
60 
9 
13 
6.11 
10 
2.7 
60 
9 
13 
6.11 
8 
14.2 
72 
11 
13 
6.09 
12 
3.2 
72 
11 
13 
6.09 
10 
10.6 
84 
13 
15 
6.02 
14 
3.7 
84 
14 
5 
5.86 
12 
7.1 
96 
15 
13 
6.07 
16 
4.3 
96 
16 
4 
5.90 
14 
3.5 
192 
32 
8 
5.90 
32 
8.0 
