420 



Of the Propagation of Heat 



If the agreement of these experiments with the ther- 

 mometers No. 2 and No. 3 surprised me, I was not 

 less surprised with their disagreement in the experiment 

 which follows : — - 



Experiment No. 16. 



Taking the thermometer No. 3 out of the boiling 

 water, I immediately suspended it in the middle of a 

 large room, where the air, which was quiet, was at the 

 temperature of 18°^ R. and observed the times of cool- 

 ing as follows : — 



9 55 = total time of cooling from 8c° to 30°. 



