Dl;s. .1 A. IIAKKKU AND I'. CIIAITIIS OX A 



PLATINUM Thermometer Readings. Experiment No. 68, 24th May, 1898. 



Bridge-centre = - "002 centim. Battery resistance = 317 ohms. 



Coils B, F, J = 10488-249. Box temperature = 15'22. 



Far-tor = 1 -f '000 0020. 



Readings. 



Mean bridge-wire reading . . = -|- 15 - 137 

 Bridge-wire correction = - 035 



Corrected bridge- wire reading = + 15 - 102 



Coils 



Bridge-wire reading 

 Centre correction . . 

 Temperature correction 



Resistance found . . . 

 Resistance at zei'o . 



(R-Ro) 



Fundamental interval . 

 Platinum temperature . 



10488-249 

 + 15-102 

 + 0-002 



+ 0-020 



10503-373 

 6110-805 



4392-568 

 2361-246 



186'027. 



In reducing the observations we have taken as the mean of the determinations of 

 initial pressure effected before and after each series the values 



millims. 

 For the first series . . . H = 793*470 ; 



For the second series . . H = 793'545. 



XXXVII. COMPARISONS WITH THE THERMOMETER K.9. 



With the thermometer K.9, which has twice the resistance ofK.8, a precisely 

 similar series of comparisons was made. The constants adopted for the calculation of 

 the nitrogen temperatures of this series were : 



