Correction of the Gas- Thermometer. 



Table XIV. 

 Scale -Correction for Diatomic Gases. 



93 





Constant-Pressure, 76 



cms. 



Constant- Volume,^) 



=100 cms.! 



Temp. 















cent. 





















Air. 



Nitrogen. 



Hydrogen. 



Air. 



Nitrogen . 



Hydrogen. 



- 250 









o 



4-1-43 



... 





+ •1005 



- 200 









+ 



•201 



4- -438 



+•460 



+ •0311 



- 150 



4- -901 



+ 



: 945 



+ 



•064 



+ •186 



+•195 



+ •0132 



- 100 



4- -314 



+ 



•328 



4- 



•0223 



+ •076 



+ •080 



+ •0054 : 



- 50 



4- -086 



+ 



•090 



+ 



•0062 



+ •0232 



+ •0243 



+ •00164 I 



- 20 



4- -0238 



4- 



•0250 



+ 



•00170 



+ 0067 



+ •0070 



+ 00048 



- 10 



4- -0105 



+ 



•0110 



+ 



•00075 



+ •0030 



+ •0032 



+ •00021 j 



4- 10 



- -0078 





•0082 





•00055 



- -0023 



-•0024 



-•00016 



+ 20 



- -0134 



— 



•0141 



— 



•00095 



-•0041 



-•0043 



-•00023 



+ 30 



- -0169 



— 



•0177 



— 



•00120 



-•0051 



-•0053 



-•00036 



+ 40 



- -0186 



— 



•0195 



— 



•00132 



-•0056 



-0059 



- -00040 



+ 50 



- -0186 



— 



•0195 



— 



•00132 



-•0056 



-•0059 



-•00040 



4- 60 



- -0172 



— 



•0180 



— 



•00123 



-•0053 



-•0054 



-00038 ! 



4- 70 



- -0146 



— 



•0153 



— 



•00104 I--0046 



-•0048 



-•00032 



4- 80 



- -0108 



_ 



•0113 



— 



•00077 ;!--0034 



-•0036 



-00024 



4- 90 



- -0058 



— 



•0061 



— 



00041 



-•0019 



-•0020 



-•00013 | 



+- 150 



4- -0409 



+ 



1 

 •0428! + 



•0029 



+ •0136 



+ 0143 



+•00097 ! 



4- 200 



4- -096 



+ 



•101 j + 



•0068 



+•0332 



+ •0347 



+ •00236 



4- 300 



4- '232 



+ 



•243 + 



•0165 



+ •084 



+ •088 



+•0059 



4- 450 



+ '472 



+ 



•495 + 



•0336 



+ •180 



+ •189 



+ •0127 



4-1000 



4-1-464 



4-1-535 ! + 



•1040 



+ •616 



+ ■646 



4- -0438 



c — b = S'l c.c. Whence the value for air would probably be, 

 c — b = 7'7 c.c. The calculated values at this temperature, on 

 the hypothesis 72 = 1*5, would be 6'8 and 7*2 c. c. for air and 

 nitrogen respectively, which are probably within the limits 

 of experimental error. If we assumed Dewar's values of 

 c — b at 90°' 5 Abs., and calculated the values of c at 0° C. 

 on the assumption n=2, we should find for nitrogen 

 c = 0*95 c. c, fr = 0*51 c.c, which do not agree so well with 

 the values of the cooliDg-effect or with Chappuis 5 values of 

 the coefficients. 



The temperature of inversion of the heating-effect in the 

 case of hydrogen has been observed by Olzewski to be about 

 — 80° C, when the gas is supplied at a pressure of 117 afcmos 

 and escapes at atmospheric pressure. The values of the 

 constants above given on either assumption n=l'5 or ft =2, 

 would give a small heating-effect SQ=— 1*7 c.c. at thi> 



