496 
The Philippine Journal of Science 
1921 
Compression in inches. 
Fig. 6. Compression parallel to grain ; stress area, 2 inches by 2 inches ; height, 8 inches ; 
apitong. 
is clearly shown in the illustration. The readings given by the 
deflectometer are used in plotting the stress-strain diagram. 
Fig. 6 shows a typical diagram for tests in compression par- 
allel to grain. The load at elastic limit is located in the same 
manner as that described for the tests of beams. 
COMPRESSION PERPENDICULAR TO GRAIN 
Fig. 7 shows the method of making tests in compression per- 
pendicular to grain. In these tests the specimen is so placed 
that the grain is horizontal or parallel to the base of the machine. 
A steel plate, 2 inches wide, is adjusted on top of the specimen. 
The moving crosshead of the machine descends upon this plate, 
