Eftperimettts on the Tranfnu^m of Heat through Fluidi. 53 j 



EXPERIMENT III. 

 Thermometer B rofe during the pouring to ^0°. 



Here the general refult is precifely the fame as in the former experiments. The only 

 remarkable difference is the fmall rife of the thermometer during the pouring in of the hot 

 oil. During that operation it rofe only 84^ °, whereas in the two former experiments its 

 rife was nearly 30°. 



Thefe three experiments were varied different ways, but the refults were fo nearly the 

 fame, that it would be both ufelefs and tirefome to relate the whole. They feem to me to 

 put it beyond a doubt that mercury is a condulior of caloric, 



I wiflied now to try whether water alfo be a conduftor. For this purJ)ofe I poured water 

 at 40° (the temperature of the air) into the veffel M, till it ftood 0.8 inch above the bulb 

 of the thermometer B. Over this I poured a thin ftratum of lintfeed oil. Then lintfeed 

 oil, heated to 220°, was poured cautioufly over all, till it ftood 1.15 iaches above the fur- 

 face of the water. The temperature of the oil, as foon as it could be afcertained after it 

 had been poured4B, was 160°. The refult of the experiment was as follows ; 



3Z2 - EXPERIMENT 



