180 Mr Wilber force, On some experiments on the [Oct. 27, 



60 



From this series of observations we take 521*5 for our value 

 of c. 



We notice that a difference of one unit in (c) makes a differ- 

 ence of two scale divisions in the equilibrium position, and this 

 is about the degree of sensitiveness that we found throughout. 



The following is a specimen of the observations taken in com- 

 paring the forks. 



August 18th. 



" 32" and " 64" compared. 



Roughly we see 49 or 50 double vibrations of the dipper per 

 minute. 



Counting with the chronometer, we get 



49 vibs. in 60J sees. 



(49 vibs. in 60 sees. 



149 vibs. in 61 sees. 

 " 32" weighted, 49 vibs. in 7l| sees. 

 " 32" more weighted, 



25 vibs. in 67J sees. 

 " 32" as at first, 49 vibs. in 60£ sees. 



