ADAMS AND JOHNSTON: STANDARD TEMPERATURE SCALE 281 



as measured by Waidner and Burgess, and to compute in this way the 

 corresponding values of 8'. These values vary irregularly at the lower 

 temperatures, as might be expected, since the influence of variation of 8 

 is small when t is small; but at the higher temperatures they show a dis- 

 tinct upward trend, and can be represented very fairly by the relation 

 8' = 1.489 + 0.000015 t. These values of 8' were combined with the 

 respective platinum temperatures to give new values of the temperature, 

 which were then subtracted from the temperatures as given by Waidner 

 and Burgess; 12 thus giving the differences between the two scales at 

 these points. These differences were applied to the average values 



TABLE IV 



Comparison of the "Corrected" Temperatures (Measured by the Resist- 

 ance Thermometer) with Determinations by the Gas Thermometer 

 and with Thermoelements. Thermodynamic Scale 



* From the thermoelectric measurements of Table III above. 

 t Temperatures transferred from gas thermometer measurement to fixed point 

 by thermocouples. 



J Direct gas thermometer determination. 



given by Waidner and Burgess, giving the "corrected" average tempera- 

 tures presented in Table IV, column I. Alongside of this we have tabu- 

 lated (in column II) the temperatures on the thermodynamic scale as 

 derived from the work of Day and Sosman, and (in column III) the 

 differences between these two sets of measurements. 



The differences at the tin and zinc points are no doubt due to the fact 

 that in these two cases the determinations were made on different sam- 

 ples of metal ; with these two slight exceptions the agreement is all that 



12 That is, the temperatures as derived from a fixed 5, obtained by calibration at 

 0°, 100°, and the S.B.P. taken as 444T70. 



