128 LOUIS VESSOT KING 
= % (incompressible fluid in the nickel-steel jacket), we have 
o. ‘Then 
(=) _ P(pounds per sq. in.) (a) 
=o ; 
C -345 X 109 
which gives for P= 200,000 pounds, 
/ 
(=) =n 8 lOme 
(ay frees 
radial strain 
a * jo"? 
oO. 
POUNDS PER SQ. IN. 
150,000. 
Fic. 2.—Showing relation between radial strain and load for a nickel-steel jacket 
containing a specimen of Solenhofen limestone under test. 
Curve I shows the observed radial strain over the center of the specimen. 
Curve II shows the radial strain calculated according to the elastic solid theory 
for rigidity “= 4.33 X 10° pound per sq. in. and Poisson’s ratio ¢ = . 278. 
Curve III shows the calculated relation between strain and stress for a specimen 
of zero rigidity. 
