349 



369.83 



T = . 



6.98460-%/) 



This gives 7^=89.896° K. 



Fi'om tliG tcible for Ft'j the following iiiutnallj corresponding 



values are found : 



w' / yv\ 



89.896 0.24988 0.25079 



The two platinnni-thermometers can now be conipared at each 

 temperature with an accuracy sufficient for our pur|)0se ') by means 

 of Nernst's formula 



wJPf, «'. I, wjFf, 



Introducing- the above value in this formula we (ind ^(=rO.OOJ 22J. 



Using this value for a it is now possible to calculate the value 



of — ~\ corresponding to each value of -y- as measured and lience 



by means of the table for Ft'/ to determine the temperature on the 

 Kelvin-scale. 



The apparatus is then placed in a bath of finely ground ice and 

 distilled water and by means of dry air fi-ee of carbon dioxide and 



of pure neon the denominator in eq. IV, In — f y( — h ^ |» is 



determined, which gives — , whereas R is found by calibrating the 



tube with mercury. When these measurements are completed, the 

 apparatus is put in a bath of solid carbon dioxide and benzene, and 

 new measurements with neon are made; this time, however, the 

 measurements are conducted in the following order : first the resistance 

 W ~ IV is measured without the wire being heated, whereby the 

 temperature of the bath is determined ; then the conductivity 

 measurements are made, first at higher pressuie, then at lower 

 pressure and again at the higher pressure, as shown in the tables, 

 and finally the resistance of the wire is determined once more 

 without heating. 



The temperature of the bath was found not to have changed 

 during the measurements. 



The correction for i-adiation is calculated from the dimensions of 



^) See G. Holst Leiden Gomm. N". 148 and P. G. Gath, H. Kamerlingh Onnes 

 and J. M. Burgers Leiden Gomm. N". 152c. 



23 

 Proceedings Royal Acad. Amsterdam. Vol. XXI. 



