588 
ROTATION FOR STABILITY OF 
of which the length is four diameters, and the cavity is a similar 
surface of two-thirds the linear dimensions of the external surface. 
Then - has the same value as before—viz.. ‘00024164: but since 
a 
c = 4a, therefore 
« 3 ^ = — jp ( 4 + n/15), 
«s C = I | i log £ (4 + V15)-A. 
Now, log V15 = 0 5880456, 
therefore V15 = 3-8723, 
• 4 + V15 = 7'8723, 
log 10 (4 + VIB) = 0-8961403, 
log w logio (4 + V15) = 1-9523759, 
logit)/* = 03622185, 
logio log* ( 4 + n/ 15) = 0-3145944, 
log 151 = 1-7641368, 
l0gl ° 111 lo S< ( 4 + V16) = 2-5504576, 
-A log. (4 + v*15) = 0-035518. 
I02 
Therefore a? A = *266666 
— *035518 
= ‘281148, 
a^C— *071036 
- *033333 
= -037703; 
=_= _--- 11 A 8 = -85977 
A + C 268851 
y = 
c_ 
2 A 
37703 
462296 
= •08156, 
a — y = -77821. 
Also, as before. 
A 3 = xyr x £ ^ + c ^ 
211 17 . . . 
= TrTr X — a 3 , since c — 4a ; 
171 5 
