S40 



Experitiunts on the Tranfmjlon of Heat through Fluids. 



EXPERIMENT IV. 



We fee from this experiment that water Is a conduflor of caloric ; but a much worfe 

 conductor than mercury. The thermometer B did not rife during the pouring in of the 

 oil, partly becaufe it was at a confiderable diftance from the furface, and partly becaufe 

 water conduQs worfe than mercury. But it did rife afterwards 61 ". It was 5' before it 

 began to rife, and 35' before it reached its maximum. The refult of this experiment was fo 

 curious, that I wiflied to repeat it with fome variation. I put all the three thermometers in 

 the water : thermometer A 0.2 inch below the furface, thermometer B 0.7 inch below 

 the furface, and thermometer C 1.725 inches below the furface. The cold water was 2.2 

 inches deep ; its temperature was 42° (that of the air). A ftratum of cold lintfeed oil was 

 poured over the water, then lintfeed oil, at 220°, was poured over all, till it ftood 2.125 

 inches above the furface of the water. The refult was as follows : 



EXPERIMENT V. 



In 



TIra«. 



