452 A. @. Compton—Record of Vibrations of a Tuning-fork. 
method depends upon the exactness of the coincidence. It 
might be estimated that'the first fraction of a revolution in this 
: , ; 1378—14 
record is 0°8 in which case the result would be --—— -=341; 
but it is preferred to reject the result, particularly as the time, 
four seconds, is short. 
C. 
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_The records A and B having been rendered somewhat indis- 
tinct in the photographic reduction, the record C is added, and 
_ 1s reproduced without reduction or reversal. It shows the — 
