The Comparison of Thermometers. 



3^3 





Mean. 



Difference from mean. 





[^■3369 





+ 0-0157 





14-3230 



14-3212 



+ -0018 



In glass 



14*3149 





— -0063 



apparatus. 



14-3168 

 I4'3l83 





— -0044 



— -0029 





114-3225 



Mean. 



+ -0013 





''i4'3226 





+ -0024 



In copper 



i4'3243 





4- 0041 



apparatus. 



14-3209 

 14-3176 



14-3202 



+ -0007 

 — -0026 





^14*3154 





- "0048 



The ratio 



R 



100 



Rr 



from the experiments in the glass 



apparatus is 1 '3463, from those in the copper apparatus 

 1-3462. These numbers agree very closely with those 

 obtained by Callendar (1-3464), and by Griffiths (1-3462). 



The following numbers will serve to show the degree of 

 accuracy which may be reached in measuring the tempera- 

 ture by platinum thermometer. 



pt is Temperature by Platinum Thermometer. 



R.T. is the boiling point of water according to Regnault, 

 corresponding to the observed pressure. 



Resistance. 



pt. 



Pressure. 



R.T. 



Pt. Corr. 



Diff. 



14-0414 

 13-8206 



92-40 

 86-47 



573*73 

 456*22 



92*33 

 86-32 



92-30 

 86-29 



+ -03 

 + •03 





Rioo= 14*3209 



Ro = 



= 106395 





14*1371 

 13-8168 



13-5516 



95*15 

 86-45 

 79-24 



636*79 

 454*98 

 33975 



95-13 

 86-25 



78-92 



95-08 

 86-26 

 78-98 



+ •05 

 — -01 

 --06 





Rioo= 14-3154 



Ro = 



= 10-6360 





14-0934 

 14-1178 

 13-8947 



i3'6523 



937« 

 94-40 



88-34 

 8176 



603-71 

 619-03 



490'59 

 376-38 



93-69 

 94-36 



88-20 

 81-46 



93-68 



94-32 

 88-i8 



81-53 



+ -01 

 + -04 



+ -02 

 --07 





Rioo= 14*3243 



Ro = 



= 10-6395 





