154 
MR. RENNIE’S EXPERIMENTS ON THE FRICTION AND 
Table V. 
Experiments on the Friction of two square inches surface of Wood at different 
angles of elevation. 
Weight on 
surface. 
Moved at 
degrees. 
Time in de- 
scending 11 
inches. 
Proportion. 
Weight on 
surface. 
Moved at 
degrees. 
Time in de- 
scending 11 
inches. 
Proportion. 
Red Teak on Red Teak. 
American live Oak on Red Teak. 
lbs. 
o / 
sec. 
lbs. 
o / 
sec. 
10 
8 00 
18 
7.116 
10 
9 00 
22 
6.314 
20 
7 45 
15 
7.348 
20 
8 00 
24 
7.116 
28 
7 15 
20 
7.861 
28 
8 30 
20 
6.691 
56 
7 00 
16 
8.144 
56 
7 45 
25 
7-348 
Black Beech on Black Beech. 
Norway Oak on Norway Oak. 
lbs. 
sec. 
lbs. 
sec. 
10 
8 15 
20 
6.897 
10 
8 00 
19 
7.116 
20 
7 20 
17 
7-770 
20 
7 30 
20 
7.596 
28 
7 40 
19 
7.429 
28 
7 00 
20 
8.144 
56 
6 40 
21 
8.556 
56 
6 20 
25 
9-010 
English Oak on English Oak. 
Elm on Elm. 
lbs. 
sec. 
lbs. 
sec. 
10 
9 30 
17 
5.976 
10 
11 40 
19 
4.843 
20 
8 30 
17 
6.691 
20 
10 30 
18 
5.396 
28 
7 40 
18 
7-429 
28 
10 00 
19 
5.671 
56 
7 30 
20 
7-596 
56 
9 30 
19 
5.976 
Hornbeam on Hornbeam. 
Honduras Mahogany on Hornbeam. 
lbs. 
o / 
sec. 
lbs. 
o / 
sec. 
10 
10 00 
20 
5.671 
10 
12 00 
22 
4.705 
20 
9 15 
21 
6.140 
20 
12 30 
21 
4.511 
28 
8 30 
20 
6.691 
28 
11 45 
21 
4.808 
56 
8 15 
19 
6.897 
56 
11 20 
23 
4.990 
Yellow Deal on Yellow Deal. 
White Deal on White Deal. 
lbs. 
sec. 
lbs. 
sec. 
10 
15 00 
10 
3.732 
10 
18 00 
10 
3.078 
20 
17 00 
9 
3.271 
20 
12 30 
ii 
4.511 
Pine on Pine. 
lbs. 
sec. 
10 
16 00 
14 
3.488 
20 
17 00 
11 
3.271 
