( 769 ) 



TABLE XI. ƒƒ,. Results for the isotherm of — 212°.82. 



N°. 



/"■ i 



,/, 



djpvj) 



t x VA 



Series II 



Series III 



17 

 18 

 19 



20 



G 



7 



O] o°. f)S! 



'21 2°. 82 



30.591 



35.420 

 33.071 

 30.554 



51.632 

 61.434 



0.10400 

 0.19134 

 0.19204 

 0.19405 



0.18707 

 0.18803 



157.64 

 185.15 

 171.68 



157.40 



275.12 

 325.08 



O.00i-5S 

 0.00473 

 0.00405 

 0.00458 



N u . 17 and N°. 20 of table XF. The results are reduced to the 



same standard-temperature by means of the values of 



\_ dt 



given in the last column. 



In table XII the results obtained in this way are also given for 

 the remaining isotherms. Those belonging to series I are less certain 

 and will be repeated. 



The results obtained at the beginning and at the end of a determination 

 of an isotherm at about the same density have been united to a mean. 



For every temperature we have added to the results of the deter- 

 minations of isotherms those of the readings of the hydrogen-ther- 

 mometer to which the former are in direct relation. 



The numbers do not agree with those of the preceding table, 

 because some determinations have been united to a mean, for which 

 reason they are indicated by ( ). 



The points of the hydrogen-thermometer have been obtained in 

 the following way. From Schalkwijk's determinations of isotherms 

 follows for 20° C. 



pv A = 1.07258 + 0.000667 d A -f 0.00000099 d A \ 



If we suppose the mean pressure-coefficient from D to 20° not 

 to deviate appreciably from the value 0.0036627 between 0° and 100°, 

 which is permissible on account of the insignificant deviations of 

 the indications of the hydrogen-thermometer of constant volume from 

 the absolute scale, it follows from this that : 



(PVA)0°, I 100 m»,. = 1.000275. 



The value given in Oomm. N°. 60 having been laken for the 

 pressure-coefficient of hydrogen for the calculation of the hydrogen 



