734 Hiley. — On the Value of Different Degrees of 
could have been prevented. Other experiments failed owing to the 
accumulator running down or other parts of the instrument going 
wrong. 
The following list of experiments includes all those in which none 
of the above-mentioned causes of failure occurred. The experiments are 
arranged in order of the centrifugal forces used, not in the order in which 
they were performed. 
1 Experiment i. Sept. 17, 1912. 9.27 a.m. to 3 p.m. 
Temp. = 20 0 C. 
Radius of rotation at middle of box 3= 6-5 cm. 
6 = 105°. 
Total period (/+ 7 ) = 11 m. 
t 
f = 3‘3i- 
R — 3-92. 
Point of equilibrium is 1*5 cm. below middle of box. 
r = Radius of rotation here = 5 cm. 
Cent, force here =3.09 mg. 
C = resultant of centrifugal force and gravity = 3-42 mg. 
Thus ^ = 3.31, =3.24. 
CT 
.*• = I *02. 
mg. t 
Experiment 2. Sept. 15, 1912. 10.15 a - m * t0 4-5 P- m - 
Temp. = 20 0 C. 
Radius of rotation at middle of box = 7 cm. 
6 = 105°. 
Total period (/+ T) = 7 m. 30 s. 
t 
Y = 3* T 7- 
R = 4.045. 
Point of equilibrium is 2*0 cm. below middle. 
r = 5 cm. 
Cent, force =3-30 mg. 
C = 3*45 mg. 
Thus ^ = 3‘ I 7,^=3-45. 
CT 
" mg.t 1 ° 9 ’ 
Experiment 3. Sept. 15, 1912. 4.15 p.m. to 10.2 p.m. 
Temp. = 20 0 C. 
Radius of rotation at middle of box = 7 cm. 
e = 1 05°. 
1 For the meaning of symbols see ‘ Specimen Experiment p. 732. 
