148 
MINUTES OF PROCEEDINGS OF 
♦ 
Series c. Table XYIII. 
EFFECT OF VARYING THE NUMBER OF SURFACES, WITH A CONSTANT PRESSURE (P) OF *5 TON, 
p = pressure per sq. in. of each surface = 35 lbs, 
S = extent of each surface = 32 sq. inches. 
Number 
of experiment. 
Nature 
of material. 
| AT, number of surfaces. 
JR, wt. to 
overcome 
G, coeffi. of friction 
B 
of motion = p 
I, impact 
of b. 
M, motion of the 
piece 
drawn through 
in inches 
per minute. 
0 
mot 
03 3 
£ ® 
f 
ion. 
i 
O 
3 
A, mean an¬ 
gular fall of b. 
V, velocity 
of 6. 
lbs. 
lbs. 
O 
ft. 
per sec 
1 
383 
217 2 
2 
370 
373 
•333 
30 
3-79 
8 
3 
365 
1 
| 
715 
218 2 
4 
720 
717 
•640 
30 
3-79 
10 
3 
bJO 
715 
o 
1 
1 
1170 
219 2 
>- a 
6 
1170 
1167 
1-042 
30 
3-79 
10 
3 
o 
1165 
1 
1* 
1592 
220 2 
a 
o 
8 
1582 
1585 
1*415 
30 
3-79 
12 
3 
u 
£ 
1682 
1 
1978 
221 2 
10 
1983 
1986 
1-773 
30 
3-79 
15 
3 
1998 
Table XIX. 
1 
515 
222 2 
2 
605 
508 
•454 
30 
3-79 
10 
3 
605 
1 
d 
992 
223 2 
.§ 
4 
1027 
1015 
•907 
30 
3-79 
10 
3 
■ 
'fn 
1027 
1 
&J0 
PS 
o 
1512 
224 2 
r $ 
6 
1612 
1508 
1-347 
30 
3-79 
12 
3 
1500 
a 
1 
o 
u 
2068 
225 2 
a 
8 
2002 
2034 
1-816 
30 
3-79 
15 
3 
2033 
o 
1 
2554 
226 2 
10 
2484 
2519 
2-249 
45 
5-61 
15 
3 
2519 
