102 MR JAMES CLERK MAXWELL ON THE 
When the longitudinal pressure 0 vanishes, 
When the cylinder is pressed on the plane sides only, 
Eilat de ai 
= = (satan) 
= ye (Ga-am) 
4. When the solid is infinite, or when a, is infinite, 

p=h, + +a, (A, —hy) 
eee 
g= hy — pap a (A, hy) 
Zi) 5 
1=a@ = 1) a,” (hy — hy) 
Che ml 2, 
Zao 0 +h) + gy Om) - . (29.) 
1 2 il il 
=*loa*sn) 35 2h, see 
ane oat Qhy) + ga (4h,—3 h,—0) 
2 foe 2a, (5 2\ _'y 
20 Sale 2 one Gee) m 
5. When dr=0 in a solid cylinder, 


Ox a, 30 | 
a  2m+3p 
30. 
6. Wh Oz Or _ 8h eve 
. a et. Fp emo 
Since the expression for the effect of a longitudinal strain is 
Ove ( 1 2 
a ae Os om 
or _ Imp Be eye 
if we make Rec then =o7 -.-- (1) 

The quantity E may be deduced from experiment on the extension of wires 
or rods of the substance, and p is given in terms of m and E by the equation, 

Em 
[orci . . . (82.) 
and Bit Oe Uren 
sox 
