296 Sir Benjamin Thompson’s 
From thefe . experiments it appears-, that the conducing 
■power of air is very much increafed by humidity. To fee if 
the fame refute would obtain when th<? experiment was re- 
verfed, I now took the thermometer with the moijl air out of 
the boiling water, and plunged it into freezing water; and 
moving it about continually from place to place in the freezing 
water, I obferved the times of cooling, as fet down in the 
following table. N. B,. To compare the refult of this experi- 
ment with thofe made with dry air, I have placed on one fide 
in the following table the experiment m queftion, and on the 
other fide the experiment N° 19. made with the thermo- 
meter N° 2. 
(Exp. N° 19.) 
Thermometer N° 4. 
Surrounded by moijl air. 
Taken out of boiling water , 
and plunged into freezing water . 
(Exp. N° 10.) 
Thermometer N° 2. 
Surrounded by dry air . . 
Taken out of boiling water \ 
and plunged into freezing water. 
Time elapfed. 
Heat loft. 
, Time elapfed. 
Heat loft. 
8o° 
— - — 
00 
O 
0 
M. Sc 
0 
M. S. 
0 
O 4 
JO 
0 33 
70 
O 14 
60 
0 34 
60 
0 31 
50 
0 44 
5 ° 
0 52 
40 
0 55 
40 
1 22 
3 ° 
1 18 
3 ° 
2 3 
20 
1 57 
20 
4 2 
10 
3 40 
iO 
0 8 ~ total time of 
012 = total time of 
cooling from 8o° \ 
Lo io°. 
cooling from 8o° 
to io°. 
Though the difference of the whole times of cooling from 
8o° to io° in thefe two experiments appears to have been very 
5 fmall. 
