35 @ Dr. Ure’s new experimental researches 
20 a = 0.170824 
400 6 = ~ 0.008324 
8000 c = + 0.000046 
0.162546 + log. 30 or 1.477121 
1.477121 
Log. of 43.62 = 1.639667 
By Biot’s formula therefore at 232 F. 
43.620 
My experiments 
- 44.700 
Mr. Dalton’s table 
43- 2 5 
Betancourt 
47.20 
By M. Pouillet’s table at the end of Biot’ 
s 1st vol. 
computed from the above formula 
43.50© 
The difference between Biot and my experiments here is 
only 1.10 inches. 
sd Example. Temperature 262° Fa hr. / = 50 
50 a =2 0.4270609 
2500 6 = — 0.0520272 
125000 c = -f- 0.0007250 
o-3757587 
Log. 30 = 1.4771213 
L °g- of f 2 6 2 ° = 1-8528800 F 2620 = 71.265 
Experiment 74.600 
Dalton’s table 69.700 
Pouillet’s table 70.800 
Betancourt 82.500 
The disparity between Biot’s formula and experiment 
becomes more apparent now : it amounts to 3.335 inches. 
