( 785 ) 



mentioned in Comm. N°. 95 c to those on the norma] hydrogen-ther- 

 mometer by availing ourselves of the subjoined table, in which the 

 corrections required for this have been given. These corrections give 

 an account of the variation in the assumed pressure-coefficienl and 

 (with regard to the number of decimals given) of the influence of 

 the dead space. 



By means of the fifth column of table XVI the corrections to the 

 absolute scale are found. Thus the tables XVI and XVIII enable us 

 to reduce the temperatures calculated according to Comm. N°. 95 e 

 and used in Comm. N os 95", 95 fi and 95 rf both to the normal hydrogen 

 scale and to the absolute scale. 



The temperatures t s occurring in Comm. N°. 97°, already corrected 

 in the first column of table XVI for the application of the corrected 

 pressure-coefficient 0.0036629 and the influence of the dead space, 

 are adjusted to the absolute scale by the corrections in the fourth 

 column of table XVI. 



§ 3. The values found by Chappuis and Travers for the pressure- 

 coefficient of hydrogen (cf. the footnote to § 7 of Comm. N°. 95^) 

 are corrected to 0.00366266 and 0.00366297 (number of decimals 

 the same as given by them). 



For the p'ession-coefneient of carbonic acid found by Chappuis 

 the correction is more considerable and amounts (because the dead 

 space is small here, the correction on account of the variation of 

 density caused by expansion of the glass is here about of the same 

 value as that on account of' the variation of density by the dead 

 space) to — 0.25xl0- G , so that the value found by Chappuis 1 ) 

 0.00372624 is corrected to 0.00372599. 



1 ) Nouvelles Etudes, Travaux et Mémoires du Bureau International. T. XIII, p. 48. 



