Experiments upon Heat. 
6 7 
The bulb of the thermometer surrounded 
by 256 grains of semen lycopodii. 
a 
Cooled. 
Cooled. 
<l> 
Heated. 
a 
K 
Exp. No. 28. 
Exp. No. 29. 
*-* U* 
u 
Exp. No. 30. 
7 °° 
- 
— 
0 
0 
— 
bo° 
14 b" 
1 57 " 
io° 
230" 
5 °° 
lb’2 
ibo 
20° 
68 
0 
40 
175 
170 
3 °° 
6 3 
3 °° 
209 
203 
0 
40 
76 
20° 
284 
288 
5 °° 
121 
M 
O 
O 
502 
513 
60° 
31b 
— 
— 
— 
7 o° 
1585 
Total times. 
1478 
1491 
— 
2 439 
In the last experiment (N° 30) the result of which was so 
very extraordinary, the instrument was cooled to o° in thaw- 
ing ice, after which it was plunged suddenly into boiling wa- 
ter, where it remained till the inclosed thermometer had ac- 
quired the heat of 70°, which took up no less than 2456 
seconds, or above 40 minutes ; and it had remained in the boil- 
ing water full a minute and an half before the mercury in the 
thermometer shewed the least sign of rising. Having at 
length been put into motion, it rose very rapidly 40 or 50 de- 
grees, after which its motion gradually abating became so 
slow, that it took up 1585 seconds, or something more than 26 
minutes, in rising from 6 o° to 70°, though the temperature of the 
medium in which it was placed during the whole of this time 
was very nearly 8o° ; the mercury in the barometer standing 
but little short of 27 Paris inches. 
K2 
