66 Prof. H. L. Callendar on the Thermodynamic^ 



Table V. — Scale-Correction for Air, H 2 , and C0 2 . 



Constant-Volume, p n 



=76 



cms. Constant-Pressure, 76 cms. 



Temp. 



Cent. 





















1 











I 





1 





Hydrogen. 



C0 2 . 



Air. 



Hydrogen, j C0 2 . 



- 200 







+■109 









+ ■586 





- 150 



+ 



•258 



+ •040 





'.'.'. 



+1-02 



+ •158 





- 100 



+ 



•099 



+ 015 







+ -328 



+ •050 





- 50 



+ 



•029 



+ •005 



+ 



"•22 



+ '086 



+ 015 + 



•65 



- 20 



+ 



•0080 



+ ■0012 



+ 



•062 



+ -022 



+ •0035 + 



•172 



- 10 



+ 



•0030 



+•0006 



+ 



•027 



+ -010 



+ •0017 + 



•076 



+ 10 





•0027 



-•0004 





•0207 



- -0073 



-0011 - 



•056, 



+ 20 



— 



•0046 



-•0007 



_ 



•0356 



- -0122 



-•0019 - 



•095 



+ 30 



_ 



•0059 



-•0009 



— 



•0452 



- -0155 



-•0024 - 



•119 



+ 40 



_ 



•0065 



-•0010 



— 



•0500 



- -0169 



-•0026 - 



•130 



+ 50 



— 



•0066 



-•0010 



— 



•0504 



- -0170 



-•0026 - 



•130 | 



+ 60 



— 



•0061 



-•0009 



— 



•0470 



- -0155 



-•0025 - 



•120 



4- 70 



— 



•0052 



-•0008 



— 



•0398 



l- -0132 



-•0020 - 



•101 



+ 80 



— 



•0039 



-•0006 



— 



0295 



- -0098 



-•0015 - 



•074 



+ 90 



— 



•0021 



-0003 



— 



•0162 



- -0052 



1 



-•0008 - 



•040 



+ 150 



+ 



•015 



+ •002 



+ 



•115 



+ -036 



1 

 + •001) + 



•274 



+ 200 



+ 



•036 



+•006 



+ 



•275 



+ -083 



+•013 | + 



■635 



+ 300 



+ 



•089 



+•014 



+ 



•683 



+ -196 



+ 031 :+ 



1-51 



+ 450 



+ 



•186 



+•029 



+ 



1-42 



t- -392 



+ •061 ; + 



300 



+ 1000 



+ 



•600 



+ •093 



+ 



4-60 



1+1-16 



+ 481 + 



8-93 



+2000 



+ 1-42 



+•221 



+109 



+2-62 



+ ■407 +20-2 



9. Comparison with Ckajipuis' Experiments. 



It is interesting to compare the results calculated in this 

 table with the experiments of Ghappuis (Bureau Internat. 

 Reports, 1888) on the differences between the scales of the 

 nitrogen, hydrogen, and carbonic acid gas-thermometers. 

 The most accurate and important of his experiments were 

 made with the constant- vohnne thermometer at an initial 

 pressure of 100 cms. The gas-thermometers were not 

 directly compared, but the same instrument was employed 

 successively with the different gases, and the readings at 

 intervals of 5° up to 50° C, and also at 61° and 78°, were 

 compared with those of four standard mercury thermometers. 



The results of the comparisons of the mercury thermometer 

 (t m ) with the nitrogen and hydrogen thermometers (t n and t h ) 

 were represented by the following empirical formula? : — 



4-^=^(100-0(-55-541 + 0-48240f-00024807f 2 ) x 10~ 6 , 



t A -t m = t{100-t) (-61-859 + 0'47351*-0-OOll577* 5! ) x 10" 6 . 



