Experiments upon Heat. 301 
of water and of mercury ; and with a table, (flowing at one 
view the conducting powers of all the different mediums 
which I have examined. 
Having filled the glafs globe inclofing the bulb of the ther- 
mometer N° 4. fir ft with water, and then with mercury, I 
made the following experiments, to afcertain the conducting 
powers of thofe two fluids* 
(Exp. N° 23.) 
Thermometer N° 4. 
(Exp. N° 24, 25, and 26.) 
Thermometer N° 4. 
Surrounded by 
Taken out of freezing 
plunged into boiling 
water, 
water , and 
water . 
Taken out 
Surrounded by mercury . 
of freezing water , and ph 
boiling water , 
mged into 
Time elapfed. Heat acquired. 
Exp.N°24« 
Time elapfed. 
. Exp.N°25. 
Exp.N°26. 
Heat 
acquired. 
— . 
0* 
. ■■ . 
— 
o° 
M. S. 
0 
M. S. 
M. S. 
M. S. 
0 19 
IO 
0 5 
0 5 
0 5 
IO 
0 8 
20 
0 4 
0 2 
0 5 
20 
0 9 
30 
0 2 
0 2 
0 4 
3 ° 
0 ir 
40 
0 4 
0 s 
0 5 
40 
0 15 
50 
0 4 
0 4 
0 7 
50 
0 21 
60 
0 7 
0 4 
0 8 
60 
0 34 
70 
0 15 
0 9 
0 14 
70 
2 13 
80 
Not obferved. 0 58 
/ 
Not obferved. 80 
1 57 — total time of heat- 
0 41 
0 31 
O 48 —total times 
ing from o° to 70°. 
of heating from O 0 to 70' 
0 
The total times of heating from o° to 70° in the three ex- 
periments with mercury being 41 feconds, 31 feconds, and 
48 feconds, the mean of thefe times is 361 feconds ; and as in 
the experiment with water the time employed in acquiring 
the fame degree of heat was 1' 57^= x 1 7 feconds, it appears 
from 
