OF ARTS AND SCIENCES. 



377 



Thus far there is no conclusive evidence that any of these coeffi- 

 cients vary in value with the temj)erature. For the present, therefore, 

 it will be assumed that they are constant between the limits 0° and 

 16°. 67. In order to compare the relative coefficients for 1\ C. S., 

 and i?2 derived from the absolute coefficients of these bars, it will be 

 better to re-determine absolute coefficients from such observations as 

 are symmetrically disposed about these limits. The following table 

 contains the observations which fall within the limits 0° ± 8° and 

 16°. 67 ± 8°. 



The following corrections have been applied to the values under 

 the first series for each bar, in order to reduce them to the system of 



the second series, viz. : ■ 



For T 



C.S. 



R. 



corr. = — 13.8div. 

 corr. = — ] i.ldiv. 

 corr. = — 20.4div. 



DETERMINATION OF THE ABSOLUTE COEFFICIENTS OF ME- 

 TERS T, C.S., AND E.2> FROM THE NORMAL VALUES FOR 0° 

 AND 1G°.G7. 



For the temperatures (t — 0°) the reductions to 0° have been made with the 

 values of b derived from the normal equations. 



The value assumed for (16°.67 — r) is written at the head of the column. 



