134 ON A COMPARISON OF PLATINUM AND GAS THERMOMETERS. 



formula to obtain the T,, the value 445'l, which is only 0- 1 lower than the mean 

 previously found from the K.8 and K.9 experiments. During this series of com- 

 parisons the pressure of the nitrogen in the gas thermometer was sensibly lower than 

 in any of the preceding ones, being only 392 millims. instead of 529 millims. 



In view of the uncertainties in the value of dt/dp and those arising from imperfect 

 data as to the expansion of the porcelain at high temperatures, we prefer to suppress 

 the hundredths of a degree from our mean result for the temperature of the boiling- 

 point of sulphur, and to give for this point the value T, = 445 0> 2 on the scale of the 

 constant volume nitrogen thermometer. 



