PRACTICAL STANDARDS FOR ELECTRICAL MEASUREMENTS. 



49 



Callendar and Griffiths's old value, 444:°-53 C, has been retained, as 



■was also the figure deduced by them from Regnault's experiments :for — - 



dp 



for sulphur, namely, -082° C. per mm., although it has been shown inde- 

 pendently, by Chree andby Harker and Chappuis, that this value for the 

 variation is considerably too small. It is hoped that a redetermination 

 of this constant for pressures between 700 and 800 mm. will shortly be 

 undertaken in the thermometric laboratory. 



BA, 



Date 



Feb. 



Au!?. 



6, 1903 

 23 



7 

 2.5 

 26 

 31 



Rfl 

 257-905 



•514 

 -505 

 •506 

 •505 

 514 

 -506 



Mean 1-5083 



E, 

 it,, 



1-38688 

 1-38702 

 1-38708 

 1-38712 

 1-38722 

 1-38722 



1-38709 



R_ 



R„ 



Mean Value of Constants 

 Ri FI ' 5 



357-736 90-831 | 15083 



Difference of 

 from Mean 



- -00021 

 - -00007 

 - -00001 

 + -00003 

 + -00013 

 + -0001 3 



1-38709 



BA., 



1903. 



