Platinum Temperatures. 



457 



by this formula, and the 6 th line gives the divergences 

 between them and the temperatures in the 2nd line, leading 

 to the probable value of a divergence as 0°'37. The absolute 

 zero (11=0) given by this formula is — 272°"45 C. 



Noting the extreme care employed in the second paper 

 (C. and Gr.), and although reluctant to give up Regnault's 

 determination of the boiling-point of sulphur 448°"38 C. (as 

 used in Gr. ; the correct value, however, being given on 

 p.146 of C. and Gr. as 447°-48 "at 760 mm. at 0° in lat. 

 45° ") I calculated another formula, from the five fixed points, 

 adopting Messrs. Callendar and Griffiths' s new value 444 0, 53C. 

 for the boiling-point of sulphur, namely 



(R-r-27-03473) 2 = 1-0477427^ + 976-2342). . . (17) 

 The 7th and 8th lines of Table V. give the temperatures 

 calculated by this formula, and their divergences from the 

 values in the 2nd line, leading as before to the probable value 

 of a divergence being o, 22. The absolute zero (R = 0) of 

 of this formula is -278°'66 C. 



In Table VI. I have collected the results given by the 

 different thermometers named A, B, C, D, E*, E, F, G, and 

 a " new " unnamed one, in the two papers. For instance, 

 in the 3rd line of the table, taken from p. 54 of (Gr.), the 

 thermometer A gives the boiling-points of aniline, methyl 

 salicylate, and mercury as 184°'22,. 223°"08, and 357°'61 

 respectively. Lines 3 to 10 are taken from (Gr.), lines 11 

 to 15 from (C. and Gr.). The (Gr.) values are calculated 

 with 448 0, 38 as the boiling-point of sulphur, the (0. and 



Table VI. 





Thermo- 

 meter. 



Aniline. 



Naph- 

 thalene. 



Methyl 

 Salicyl. 



Benzo- 

 phenone. 



Triph.- 

 Methane. 



Mercury. 



Sulphur. 



From Table I. 

 (Gr.) 



\ 



181-41 



21806 



222-88 



306-08 



f 



357-25 

 358-2 



] 418-38 



Gr. p. 54 ... 



A 

 B 



O 



18432 

 184-27 

 184-29 





22308 

 22312 

 22316 







35761 

 35759 



357-65 





p. 55 ... 



D 



18421 











357-54 





p. 58 ... 



E* 



184-24 















pp. 60, 61... 



E 



F 



G 



18420 

 184-23 

 184-23 





22318 

 223 21 





35738 

 357-33 



357 64 



35768 

 35762 





C. and Gr. n< 



iw value. 















44453 



C. and Gr. 1 

 p. 148... j 



L.M^Mj 













35660 





p. 150 



E 



18411 



217-88 



222-98 



305-82 



35647 



35674 







F 



18413 



217-96 



22308 



305-87 





35682 







G 



184-14 



21798 





305-78 



356-41 



356-71 





p. 152 



" new" 





21804 









356-73 





