SO.Mi: MKUCUKY STANDARDS OF RESISTANCE, ETC. 



109 



a = 85693 X KT 8 , b = 102998 X lO' 11 , and x - + 94 X 10~ 7 . The resulting 

 equation 



Rr = R,[l + 0-00088018T + 0'00000105793T 2 ] 



represents the change of resistance with temperature of mercury in Jena 16'" glass. 

 The differences " calculated values observed values" are given in the accompanying 

 table. 



TABLE XII. Mercury Standard U, Jena Glass 16'". 



Calculated Observed Values. 

 U T = U + '00085693T + '00000 102998T*. 



These observations were taken after the standard had been railed to the temperature 24 C. 



f f ha been token equal to + -000009 instead of + OOOU09, in above calculations. Hence the difference* are all too 

 mall by 39 x -0000004- -000016. 



