496 The Philippine Journal of Science 1921 
Compression in inches. 
0.01 0.02 0.03 
is , 
18.000 ca 
a mae load 
16000 }— i Sas c= 
4 —Flosti¢ limit 
12.000 V 
ard aad 
ng js a 
8,000 ead 
Load in pounds 
Pe 
4000 Va 
| 
Fic. 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,. 
