338 



PEOCEEDINGS OF THE AMERICAN ACADEMY 



Reducing the value h = 1.23 /a to its equivalent for one degree 



Centigrade, we have the following values for the absolute coefficient 



of 7^: — 



From comparison with Fbrster, 16.48 |m. 



« « Pierce, 16.60//. 



« « Pierce, 16.62 /i. 



It will be seen that these values are somewhat larger than the value 

 derived from the observations which follow ; but it can hardly be ex- 

 pected that the correct relation between T and " 49 " could be obtained 

 from the limited number of observations here given. 



Comparison of the Froment End-Meter F^ with T^^ 

 WITH Comparator No. 1. 



We have, therefore, for 0° C, 



y«=_i?;=:+110.0/x. 

 F, — A =+ 8.4,.. 



T^'^' — A =:+102.8,x. 

 Diff. = 1.2 |M. 



But 



Whence 

 According to Tresca 



* This value of 6 is the final value derived from the investigation on the 

 following pages. 



