122 DE. JOULE ON SOME THEEMO-DTNAMIC PEOPEETEES OP SOLIDS. 
104. Copper. -A piUar 2 inches long and one-qnarter of an inch in iametei, bemg 
pressed by 717 lbs., gave a deflection of lO'-l, indicating a themal effect of 0 loo9. 
The theoretical result is 
292 m 1_ 1 ^_L-~0°-lo6. 
1 ^58200^ -095 ^-1744 
106 PUlar, 2 inches long and half an inch in diameter. A pressure of 132o lbs. 
applied by the lever, pve a deflection of 30', indicating a nse tn temperatuie o. 
0°-08316. The theoretical result is, 
XT„W 13^ 
^"1390 ^ 1 ^58200 
x_l-x-=^=0°-06972. 
^ -095 ^ -7207 
Pressures of 1850 and 4164 lbs., communicated by the hydi-aulic press, produced deflec- 
tions of 24'-l and 56', indicating temperatures of 0°-1182 and 0'>'2i4, respecme;. 
The theoretical results are 
292 1850, , 1 .. 1 w ^ — n°.nQ74 
1 ^58200 ^-095 ^-7207 
and 
292 4154 
H=I390X — X 
■ v-^x— !-^=0°-2188. 
58200 ^-095 ^'7207' 
106. Pillar, 2 inches long and 1 inch in diameter. A pressure of 1792^1b^ commu- 
nicated by the lever, gave a deflection of 9'-7, indicating a rise equal to 0 -0. > 8. Ihe 
theoretical result is 
= 0°-023. 
291-2^, 1792 — 
^“"13^^ 1 ^58200 '^•095 ^2-953 
Pressures of 4154, 8762, and 20282 lbs., communicated by the hydi-auhc press, 
produced deflections of 10'-6, 33', and 1° 9', which were found to indicate elevations ot 
temperature of 0°-0494, 0“-1538, and 0°-3216 respectively. The theory gives 
^“1390^ 1 ^ 
XT— 
^“1390^^ 1 
58200^ ’095 ^ 2*953 
=:0°’05322, 
and 
291 20282 
^”1390^ 1 ^ 
58200 
1 
X 
■095 
X;iAy=0“-1122, 
■ 2-953 
1 
58200 
-V— X— ^=0°-26. 
*095 ^2*953 
A pressure of 57146 lbs. squeezed the pillar to the length of 1-32 inch. Then, when 
the full amount of set had taken place, the application of the same wnight gave L A 
of deflection, indicating a rise of temperature equal to 0°-643. The theoretical result is 
57146 
-r-r 291 
H = TT777aX 
X 
.X-L-XTT7r7=0°’4832. 
V A .nQ(7 4*4'74 
1390'^ 1 ''58200^^*095 ■^4*474' 
107. Lead.— A pillar, 2 inches long and half an inch in diameter, being pressed by the 
