38 
In our present example 
n — 35-83 
tz= h±h = 12-725" 
Myl 2 == 35651 
2Pa 2 = 94704* 
p = 5 ’ 724 milligrams. 
The length of time occupied in this determination was 
not quite a quarter of an hour. 
The following table contains a series of results which I 
have obtained of the weight of two centigramme riders, the 
first of which was accidentally destroyed after the conclu- 
sion of the 4th determination. As the rider was always 
placed at division 5 on the beam, the values given in the 
table are double those actually obtained. 
No. of 
Experi- 
ment. 
M0l 2 +2Pa 2 
t 
in seconds. 
n 
Weight 
of rider 
in milligram- 
mes. 
Mean Value. 
1 
145364 
8-921 
13*458 
9*78 
\ 
2 
309356 
1765 
25*49 
10-05 
3 
519769 
20-435 
19-12 
9-55 
f 
/ 9*96 mgms. 
4 
130355 
13‘10 
34-71 
10-47 
J 
5 
130355 
12-87 
36-6 
11-44 
6 
130355 
12-72 
35-50 
11-35 
7 
130355 
12-725 
35-83 
11-45 
/ 
z 1 11*35 mgms. 
8 
! 
130355 
12-81 
35-5 
11-20 
9 
130355 
12-903 
36-37 
11-31 
/ 
10 , 
454405 
19-406 , 
22-08 
10-58 
* For this as for several other cases I removed the pans and hung the 
weights directly by fine wires from the suspending-pieces. By this 
means the resistance of the air was very much diminished. 
