1165 



hereby rendered doubtful: for this reason they have been omitted. 

 The temperatures wei-e determined on the lielinmthermometer which 

 is described in Comm. N". lölnf,. lis freezing point pressure was that 

 of the international helium thermometer viz. 1000 mm. 



§ 3. Measurements and results. 



In general the resistances above 1 ohm were measured according 

 to Kohlrausch's method of the overlapping shunts; those below 

 1 ohm with a compensatiorj-apparatus free from thermo-effects ac- 

 cording to DiF.ssB-LHORST, bj the successive compensation of the 

 potential on a standard ohm and on the resistance which are joined 

 in series in one circuit. The temperatures are reduced to the abso- 

 lute scale by means of the corrections calculated from the helium 

 isothermals (Comm. N". 102a,b ^)) and using 0.0036614 as the pressure- 

 coefficient '). The accuracy of the measurements may be put at 

 .01 of a degree for the determinations above — 216° C and below 



1) They are therefore expressed on what was called the international Kelvin scale 

 in Leiden Gomm. Suppl. N". 34a. 



9) Comp. Leiden Gomm. N" 141a, p. 5. These Proc XVII (1) p. 503. 



