394 



FORESTRY INVESTIGATIONS U. S. DEPARTMENT OF AGRICULTURE. 



SAMPLE RECORDS OF TESTS. 



CKOSS BREAKING TENT. 



[116. 



Mark, 1. 



White pine. 



Length, 60.0 inches. 

 Height, 3.74 inches. 

 Breadth, 3.75 inches. 



Strength of extreme fiber, 

 * 3 W I 

 where /=2y^s==5, 660 pounds per square inch. 



Modulus of elasticity =1,320,000 pounds per square inch. 

 Total resilience =3,460 inch-pounds. El. Res., 550. 



Resilience, per cubic inch. =4.11 inch-pounds. El. Res., 0.65. 



[Number annual rings per incb =19 ] 



July 18, 

 1891. 



Load. 



h. m. 



4 24 

 25 

 26 

 27 

 28 

 29 

 31 

 33 

 35 

 37 

 40 



.200 

 1,000 

 1,600 

 2, 000 

 2,200 

 2,400 

 2,600 

 2,800 

 3,000 

 3, 200 

 3,300 



Deflection. 



,042 



• *jX X 



.300 



,454 



.511 



.595 



.690 



.853 



1.015 



1.276 



1.521 



Micrometer. 



0.757 



0.926 



3 065 



1.169 



1 226 



1.310 



1.405 



1, 568 



1. 730 



1.991 



2 236 



Kemar&s. 



2? 

 Maximum load. 



Deflection, in, inches. 



