282 
Sir Benjamin Thompson’s 
thermometer N° 1 . 
Its bulb half an inch in dia- 
meter, fhut up iii the center 
of a hollow glafs globe, 1 \ 
inch in diameter, void of air , 
and hermetically fealed. 
"Taken out of freezing water , 
and plunged into boiling water . 
Time elapfed. 
Heat 
Exp. N° 3. 
Exp. N° 4. 
acquired. 
M. S. 
M. S. 
o° 
0 
O 51 
O 5 * 
10 
0 59 
0 59 
20 
1 1 
1 2 
3° 
1 18 
1 22 
40 
1 24 
1 23 
50 
2 0 
1 5 1 
60 
3 3° 
3 6 
70 3 
11 41 
10 27 
80 
22 44 
21 i = total time 
of heating from o° to 8o°. 
Total time from o° to 70° : 
M. s. 
In Exp. N° 3. = 1 1 3 
In Exp. N° 4. = 10 34 
thermometer N° 2. 
Its bulb half an inch in dia- 
meter, (hut up in the center 
of a hollow glafs globe, if 
inch in diameter, filled with 
air , and hermetically fealed. 
Taken out of freezing water , 
and plunged into boiling water . 
Time elapfed. 
Heat 
Exp. N° 5. 
Exp. N’ 6 . 
acquired. 
M. S. 
M. S. 
o° 
0 
O 50 
O 30 
10 
0 35 
0 37 
20 
0 41 
0 41 
3° 
0 49 
0 53 
40 
1 1 
0 59 
5° 
1 24 
1 20 
60 
2 45 
2 25 
70 
9 10 
9 3 8 
80 
16 55 
17 q = total time 
of heating from o° to 8o°. 
Total time from o° to 70° : 
M. s. 
In Exp. N° 5. = 7 45 
In Exp. N° 6.-7 25 
Medium = 10 48! 
Medium = 7 35 
It appears from thefe experiments, that the conducing 
power of air to that of the Torricellian vacuum, under the cir- 
cumftances defcribed, is as 744- to 10 1 M inverfely, or as 1000 
to 702 nearly ; for the quantities of heat communicated being 
4 equal, 
