DE. JOULE ON SOME THEEMO-DTNAMIC PEOPEETIES OP SOLIDS. 
121 
pressed by the lever to the extent of 730 lbs. produced a deflection of 41', which was 
proved to indicate a rise of temperature equal to 0°’1123. The theoretical result is 
287-6 730 
^“1390^ 1 ^90139 
1 _ 1 _ 1 
^ 1 QS ^ -T 
•1198 ''•1281 
= 0°'1091. 
Another experiment, with 1010 lbs. pressure on another bar, gave a thermal eflect 
of 0°*1667, theory giving 
288-6 _ 
^~1390 ^ 
1010 _ 1 _ 1 _ 1 
1 ^90139^ -1198^ -1346“ 
0°-1443. 
101. Pillar, 2 inches long and half inchin diameter. A pressure of 1060 lbs. applied 
by the lever, produced a deflection of 6'-5, indicating a thermal effect of 0°-0454. The 
theoretical result is 
H= 
285-3 
1390 
1060 
X— X 
1 1 
90139^-1198 
0°-0353. 
102. Using the hydraulic press, pressures of 1850, 4154, and 8762 lbs., produced 
thermal effects of 0°-0822, 0°-1883, and 0°-3423 respectively. The theoretical results are 
and 
285-3 A850 
1390 ^ 1 
285-3 _ 4154 
1390 ^ 1 
285-3 8762 
1390 ^ 1 
_ 1 _ 1 
^90139^-] 198 
_ 1 1 
^90139^-1198 
1 _ 1 
^90139^-1198 
X: 4 y= 0 »- 0616 , 
x47=0°-1385, 
X:^=0'’'292S. 
Under a pressure of 20282 lbs. the pillar broke diagonally, the deflection of the needle 
indicating an evolution of 4°-16. 
103. Pillar, 2 inches long, 1 inch in diameter. A pressure of 1781 lbs. applied by 
the lever, gave a thermal effect of 0°-01365. The theory gives 
H= 
290-8 
1390 
X 
1781 _ 1 _ 1 
1 ^90139^-1198 
1 _ 
0°-01466. 
Using the hydraulic press, pressures of 4154, 8762, and 20282 lbs. gave thermal effects 
of 0°-0364, 0°-0511, and 0°-1463 respectively, the theoretical results being 
TT— — 
^~1390^ 
TT_ 290 
^~1390^ 
-.j 290 
^“1390^ 
4154_ 1 _ 1 _ 1 
1 ^ 90139 ^ -1198 ^ 2-352“ 
8762 _ 1 _ 1 1 
1 ^20139^-1198^2-352“ 
20282 _ 1 1 _ 1 
r~ ^ 90139 ^ -1198 ^ 2-352 
0°-0341, 
0°-0719, 
= 0°-1666. 
Under 47930 lbs. the pillar was squeezed to the length of 1-78 inch. Then with the 
same pressure I obtained a thermal effect of 0°‘4708. The theoretical result is 
290 47930 
H = 139oX-i-X 
90139 
^ -1198 ^ 2-643 
1 
