120 DB. JOULE ON SOME THEEMO-DYNAMIC PEOPEEHES OP SOUDS. 
96 My next experiment was n-ith a piUar of the same length, but hatf an inch m 
^ ^ finfiOlh'? In nillars of ttiis and greater diameters the 
diameter, using a pressure of 1060 lbs. in pmars oi 6 yyill.r in water 
experiment to test the value of the deflections was made by plunging the pillar m . 
wMohTose a little above the orifice in which the thermo-electric luncuon was msened. 
Thus in the present instance I found the deflection of 8'-94 to mdicate a nse o p - 
rature equal to 0°-0S19. The theoretical result is 
289 ^^10^ ^ 
1 
V — ^ V — X -TTWi = 0°-039. 
^ 81200^ ’ll ^ ‘632 
96. Wishing to try higher pressm-es, I employed a very excellent 
messure exerted by which I had ascertained by experiment as far as -000 lbs. 
friction amounted to only one-seventh of the exerted force. By supply 
thus indicated, I had a very convenient and tolerably acemate mode of 
by simply placing weights on the handle of the pump. A pressure of 64o8 lbs. apphed 
in this way. gave a deflection of 42' at the 
40 yards, which deflection was found to mdicate a thermal effect of 0 2o44. 
tical result is i i 
285-5 ^ ^0°-235. 
^~T39d^ 1 ^ 81200^ -11 ^ -632 
97 Next I tried a pillar 2 inches long and 1 inch in diameter. hen a pressure of 
1780 lbs. was applied to this by the lever, the needle was deflected 10-6, indicatmg 
a rise of temperature of 0°-01803. The theoretical result is 
1 1 1 
290-6 17^ ^ 
^” 1390 ^ 1 ^ 81200 ^ - 11 '^ 2-533 
— = 0°-01642. 
98. With the hydraulic press, pressures of 4154, 8762, and 20282 lbs produced 
deflections of 9', 2T'6, and 1° 15'-3 respectively, indicating temperatures ot 0 Ooio., 
0’-07678, and 0°-2642. The theoretical results are — 
1390 
289-8 _ 
1390 ^ 
1 
8762 
81200^-11^2-533 
= 0°-03822, 
X 
81200^ -11 ^ 2-533 
= 0°-08063, 
and 
289-8 20282 
h=t39oX-i-x 
* X — X -rv=0°T866. 
81200^ -11 ^ 2-533 
99 On applying a pressure of 47930 lbs., the pillar was squeezed to the lei^th of 
1.88 in°h, g^ng^out'^about or nearly the thermal equivalent the work rims 
done Then using the lighter pressure of 37744 pounds I obtained a deflection of - 6 , 
indicating a thermal effect of 0°.442. The theoretical result is 
290 3^ I_ 
^=1390^ 1 81200 
^ -11 ^ 2-694 
= 0°-3266. 
100. Cmt Iron.—^ pillar 2 inches long and one-quarter of an ineli in diameter being 
