Experiments upon Heal . 
289 
(Exp. N° 15.) 
Thermometer N° 3 » 
Its bulb half an inch in dia- 
meter, fliut up in the center of 
a glafs tube, 3 inches 7} lines 
in diameter, and iurrounded by 
air , 
Taken out of freezing water % and 
plunged into boiling water , 
(Exp. N° 4. and N° 5.) 
Thermometer N° 2. 
Its bulb half an inch in diameter, fhut up in’ 
the center of a glafs globe, i| inch in dia- 
meter, and furrounded by air. 
Taken out of freezing water , and plunged intc 
foiling water. 
Time elapfed. 
Heat 
Time elapfed. Heat acquired. 
Exp. N° 4. Exp. N° 5 
. Medium. ac 
:quired 
- — ■— o° 

°o 
to. s. 
M. S. M. S. 
Me S. 
0 
O 33 TO 
0 30 0 30 
0 30 
10 
O 38 20 
0 35 0 37 
0 3 6 
20 
0 54 3 ° 
0 41 0 41 
0 41 
30 
0 51 40 
0 49 0 53 
0 5 1 
40 
1 7 50 
11 0 59 
1 0 
50 
1 28 60 
1 24 1 20 
1 22 
60 
2 28 70 
2 45 2 25 
2 35 
70 
90 80 
9 10 9 3 8 
9 24 
80 
16 59 zz total time of 
16 55 i 7 3 
16 59 - 
: total 
heating from O 0 to 8o° 
time of heating from 0 
5 to 8o°. 
Time from o° to 70° = 7' 59". 
Time from O 0 
to 70 Q zzn f 35" 
If the agreement of thefe experiments with the thermome- 
ters N° 2, and N° 3. furprifed me, I was not lefs furprifed 
with thekdifagreementin the experiment which follows* 
Experiment N° 1 6. 
Taking the thermometer N° 3. out of the boiling water, I 
immediately fufpended it in the middle of a large room, 
where the air, which was quiet, had the temperature of i 8°| 
R, and obferved the times of cooling as follows : 
Vol. LXXVL 
Time 
