266 The Temperature of Water 



more than 10 seconds when I distinctly saw that the 

 mercury in the thermometer belonging to the cork cup 

 was in motion, and, when 50 seconds had elapsed, it had 

 risen four degrees, viz. from 32 to 36. 



When 2 minutes and 30 seconds had elapsed, reckon- 

 ing from the moment when the metallic point was intro- 

 duced into the cold water, the thermometer had risen 

 to 39, and at the end of 6 minutes to 39^-, when it began 

 to fall ; but very slowly, however, for at the end of 8 

 minutes and 30 seconds it was at 39!. 



A small mercurial thermometer, the bulb of which 

 was placed on one side of the cork cup at the distance 

 of about y 2 Q- of an inch from it, showed no signs of being 

 in the least affected by the vertical current of warm water 

 which descended from the conical point into the cup in 

 this experiment. 



This experiment was repeated four times the same 

 day (the I3th of June, 1805), and always with nearly 

 the same results. The mean results of these four ex- 

 periments were as follows : 



