738 Hiley . — On the Value of Different Degrees of 
Total period (/+ T) = 
r-"+ 
R = 3-0. 
: 5 m. 3OS. 
Point of equilibrium is 1 cm. below the middle of box. 
r = 29 cm. 
Here C = 11-4 mg. 
Thus 7^ = 1 1-6, — = 
T mg 
CT 
= 0-98. 
mg. t 
= 1 1 ' 4 - 
Experiment 12. Dec. 19, 1911. 8.27 a.m. to 3.45 p.m. 
Temp. = 1 9 0 C. 
Radius of rotation at middle of box = 30 cm. 
9 = 94°. 
Total period (/+ T) = 
Y - I 3 - 8 - 
R = 3-3 1 - 
7 m. 45 S . 1 
Point of equilibrium is 1 cm. below middle of box. 
.*. r = 29 cm. 
C = 13-2 mg. 
„ / n C 
Thus -r — 13-8, — : 
T J mg 
CT 
.*. — 096. 
mg. t 
= i 3 * 2 - 
Experiment 13. April 28, 1912. 10-23 a.m. to n p.m. 
Temp. = 20 0 C. 
Radius of rotation at middle of box =27 cm. 
6 = 94 0 . 
Total period (/+ T) = 
-f — i 6 ' 5 - 
11 m. 
R= 3-74- 
Point of equilibrium is at middle of box. 
.-. r — 27 cm. 
C = 15 2 mg. 
Thus 7^ = 16-5, — = 
1 mg 
CT 
= 0-92. 
mg./ 
= i 5 - 2 - 
1 37 sec. rotation, 3 min. 21 sec. rest; 26 sec. rotation, n min. 7 sec. rest, and repeat. 
