26 Messrs. C. W. Waidner and F. Mallory on 



Determination of 8. 

 « B s = 679-510 when barometer = 769"20 mm. 

 u _ 679-510-258-362 _ 

 ^ ts - 9^716 '" 4 ^ dD ' 



" Now the boiling-point of sulphur at 769-20 mm. 



= 444°-53 + 0°-082 x 9-20 = 445°-28. 



.-. 445°-28-422°-35 = S{(4-453) 2 -4-453}, 



.-. 8 = 1-491. 

 " Final Results : — 



R 1 = 358-078 Sl- 1-88596 



E = 258-362 K " 



8 = 1-491," 



FI= 99-716 



Results of Comparisons. 



In order to show in detail the method of comparison, we 

 have selected at random the results of a single comparison of 

 Baudin 6166 with the platinum thermometer (Table XL). 



In Columns II., 111., and IV. are shown respectively the 

 coils used, the bridge-wire reading, and temperature of coils, 

 for the measurement of the resistance of the platinum thermo- 

 meter. The corresponding stem-reading on the mercurial 

 thermometer, taken at the same instant, is shown in 

 column VIII. The temperature of the air near the portion 

 of the stem of the Baudin thermometer projecting from the 

 calorimeter, and of the water in the small water-jacket around 

 the stem, where it emerges from the calorimeter, is shown 

 in columns IX. and X. 



The resistance of the platinum thermometer is deduced 

 from the observed quantities, shown in columns II., III., 

 and IV., as follows : — To the nominal value of the coils is 

 applied the " coil-correction " to reduce to mean box-units; 

 these are taken from Table I., and are designated " coil cor." 

 in column II. ; a further correction for tne temperature of 

 the coils must be applied to reduce to " the mean box-unit of 

 Box No. 7 at 20° 0." ; these corrections are applied in 

 column IV. To the bridge-wire reading is applied the 

 " calibration correction " to reduce the observed reading to 

 mean box-units ; to this must be further applied the " zero 

 correction,'"' which takes into account the amount by which 

 the zero of the vernier differs from the zero of the scale when 

 the bridge is balanced w r ith the intervals CiC 2 and PiP 2 short- 



