132 
MINUTES OF PROCEEDINGS OF 
Series a. Table I. 
EFFECT OF USING DIFFERENT NATURES AND AMOUNTS OF SURFACES UNDER A CONSTANT 
pressure of one ton. P~22401b., 6=31b., r radius of 6=20". 
TWO SURFACES. THROUGH OAK. 
Number 
of experiment. 
TVnt.iirp 
of material. 
S, amount of surface. 
P, pressure per square 
inch = -g 
B,*wt. to! 
aver come 
friction 
of 
motion. 
C, coeffi. of friction 
72 
of motion = p 
I, impact j 
of b. \z 
M, motion oi tne 
piece drawn through 
in inches per minute. 
Remarks. 
i 
3 ^ 
C3 O 
Sp3 
cS d 
<V 
^ t 
1-5 ■ 
^ o 
a . | 
OS <3 
a> S3 
o ** 
9 
CD 
3 
in. 
lbs. 
lbs. 
lbs. 
o 
ft. 
868 
] 
per sec 
1 2 
64 
35 
878 
871 
•388 
30 
3-79 
20 
Motion slightly irregular. 
3 
868 
1 
* 
764 
2 2 
o 
32 
70 
739 
759 
•339 
30 
3*79 
36 
Motion regular. 
3 
-a 
774 
1 
y ° 
730 
3 2 
u 
£ 
16 
140 
694 
718 
•320 
75 
8-92 
180 
The pressure appears to produce 
3 
730 
cohesion, hence the large im¬ 
1 
'eS 
720 
pact to establish motion. 
4 2 
o 
4 
560 
671 
690 
•312 
52*5 
6-49 
... 
Very quick and irregular. 
3 
643 
4, 
727 
Grain slightly scored. 
1 ' 
902 
5 2 
64 
35 
936 
924 
•412 
30 
3*79 
10 
Motion regular. 
3 
936 
1 
cS 
o 
798 
6 2 
32 
70 
794 
797 
•356 
30 
3*79 
25 
Motion regular. 
3 
bfi 
pi 
798 
1 
r § 
765 
7 2 
1 
16 
140 
694 
730 
•326 
75 
8-92 
160 
Same as No. 3 experiment. 
3 
a 
730 
1 
pq 
676 
8 2 
4 
560 
642 
657 
£ 293 
30 
3-79 
14 
Elm compressed, oak slightly 
3 
652 
scored. 
1 
957 
9 2 
64 
35 
937 
947 
•422 
30 
3*79 
2-8 
Motion regular. 
3 
,*3 
947 
1 
03 
O 
764 
10 2 
, 32 
70 
729 
759 
| -339 
30 
3-79 
16 
Motion regular. 
3 
hi 
pi 
784 
1 
O 
u 
740 
i 
11 2 
.a 
16 
140 
730 
» 73C 
> -326 
75 
8-92 
36 
Same as No. 3 experiment. 
3 
720 
) 
1 
661 
12 2 
EH 
i 
4 
560 
680 
5 670 
) -299 
30 
3*79 
25 
Teak compressed, oak scored. 
3 
66? 
5 
1 
1070 
3 
13 2 
0! 
! 64 
35 
1066106* 
> -475 
30 
3-79 
6 
Motion regular. 
3 
C 
) 
105! 
1 
1 
'h 
J 
£) 
96' 
7 
14 2 
1 l 5 
l 32 
70 
93' 
7 94' 
7 -423 
30 
3-79 
18 
Motion regular. 
3 
: J 
1 
93' 
7 
1 
a 
) 
107' 
7 
15 2 
1 .5 
5 16 
140 
104! 
21101 
9 -491 
75 
8-92 
40 
Same as No. 3 experiment. 
2 
H 
118: 
L 
1 
# By “friction of motion ” is meant friction with impact, 
