180 MR. A. NORMAN SHAW: A DETERMINATION OF THE ELECTROMOTIVE 
Table XYII. 
seconds 
Mean value of Ti before taking deflection set on May 28. 
11-6564 
„ „ during „ „ „ June 3. 
11-6564 
>> >> j? v) Juno 13. 
11-6564 
,, ,, after ,, „ ,, June 28. 
11-6564 
Mean value of Tx . . . 
11•6564 0 
Mean value of T 2 before taking deflection set. 
6-5620 
jj )> ciffcor ,, ,, ,,. 
6-5621 
Mean value of T 2 . . . . 
6-5620 5 
The slight variation in T 2 is probably due to a variation in the very small distance 
which the cylinders remain apart, at the inside position. This distance was approxi¬ 
mately 0‘0004 cm. at the time of the final observations on d 2 . The cylinders after 
careful polishing had been placed in positions giving values of d x and d 2 most closely 
corresponding to the mean of those recorded in Tables XII., XIII., and XIV. 
The distance between the inner edges at the external position 
at 20° C. = 30‘2874 cm. 
The distance between the outer edges at the external position = 447848 cm. 
Hence 
d l = 1(30-2874 + 447848) = 37’5361 cm. 
The distance between the inner edges at the internal position = 0’0004 cm. 
The distance between the outer edges at the internal position = 14’4978 cm. 
Hence 
d 2 = 1(14-4978 + 0-0004) = 7 - 2491 cm. 
Substituting for d u d 2 , T l5 T 2 , and M in formula (9) we have 
4^((3L|«J-(L2|91J} 392-351 
B ~ 11-6564 2 —6-56205 2 
= 56593 - 2 . 
This is the value of B during the deflection observations, and it is important to note 
again that it represents the directive force of the suspensions only at the instant of 
the initial deflection after a long period of rest. 
