Rowland's Thermometers with the Paris Standard. !'■) 



give the corrected value of J 12 , which shall be called J' 12 . 

 This gives 



J 10 



W 



W 



l7° + 17 -(7°+C 7 ) 

 10 



V -^ - 

 12 ~10- 10fO 17 -C 7 



=J 



10° + 1T -G, 



10 



12 io+c 17 -cy 



When Oj 7 -C 7 is very small, as is always the case in these 

 corrections, this may be written 



j' ls =Ji S (i-^^- r +. • • .)-Jii+JiJi. 



where 



C 7 — C 17 



Pl2 



10 



This conversion factor, P 12 , was calculated similarly for 

 each degree of the scale where it was necessary, and for each 

 thermometer, and the corresponding value of J / calculated. 

 Then, taking account of the number of observations on each 

 thermometer used in getting the average value of J, these 

 corrected values were averaged for each degree at which 

 observations were made. The resulting values are given in 

 Table IX. These values were plotted, and a smooth curve 



Table IX. 

 General result of comparisons. 



Column A. Temperatures on absolute scale. 



Column B. Corrected values of the mechanical equivalent of heat, hydrogen 



scale, kilogramme-metres at Baltimore, from smooth curve. 

 Column C. Same, converted to the C.G-.S. system. 

 Column D. Old values, from Rowland's paper, table liv., p. 196. 



A. 



B. 



C. 



D. 



A. 



o 



21 



B. 



C. 



D. 



o 



5 







4212 



426-5 



4180 



4177 



6 



4289 



4203 



4209 



22 



426-4 



4179 



4176 



7 



428-7 



4201 



4207 



23 



4263 



4178 



4175 



8 



428-5 



4199 



4204 



24 



426-2 



4177 



4174 



9 



428-3 



4198 



4202 



25 



426-1 



4176 



4173 



10 



428-1 



4196 



4200 



26 



426-1 



4176 



4172 



11 



427-9 



4194 



4198 



27 



4260 



4175 



4171 



12 



427-7 



4192 



4196 



28 



426-0 



4175 



4171 



13 



427-6 



4191 



4194 



1 29 



425-9 



4174 



4170 



14 



427-4 



4189 



4192 



! 30 



425-9 



4174 



4171 



15 



427-3 



4188 



4189 



! 31 



425-9 



4174 



4171 



16 



427-1 



4186 



4187 



| 32 



425-9 



4174 



4171 



17 



427-0 



4185 



4185 



I 33 



425-9 



4174 



4172 



18 



426'9 



4184 



4183 



I 34 



425-9 



4174 



4172 



19 



426-7 



4182 



4181 



35 



426-0 



4175 



4173 



20 



426-6 



4181 



4179 



36 



426-0 



4175 



4173 



' 





XlO 4 



X10 1 



1 





XW 



X10 4 



