TIMBER PHYSICS METHODS. 



3!fi 



(3. 

 Mark, -13. Longleaf pine. 



ll. 



Length, 60.0 inches. 

 Height, 3.50 inches. 

 Breadth, 3.72 inches. 



[Number annual riiijrs per inch =23.] 



6000] 



CKOSS BREAKING TKST. 



Strength of extreme fiber. 

 3 1C 1 

 where /" ., i . j= 10,230 pounds per square inch. 



Modulus of elasticity =l,7(iO,()00 pounds per square inch. 

 Total resilience =5,110 incli-pniinds. El. lies., 1,780. 



Resilience, per cnliic inch (>.">! inch-i>oiinds. El. Res., 2.28. 



4000 



Reflection in inchea. 

 FIN.4L RECORD OF TIMBER TESTS. 



Mark. 



Longleaf pine : 

 3 



1. 



White pine: 



116 



I 



3 



Percent- 

 age of 



moisture. 



Cross bending test. 



Dimensions. 



Length. 



16.8 



1 " 



Inches. 

 60.0 



.11. y 



Height Tireadth. 



Inchss. 

 3.50 



3.74 



Inches. 

 3.72 



3.75 



Time. 



Mm. 

 15 



Load. 



Pounds. 

 5,180 



3,300 



Strength 

 Deflec- i per 

 tion. square 

 inch. (/) 



Inches. 

 1,644 



1,521 



Pounds. 

 10,230 



5,660 



* Resilience 

 Modulus in inch 

 of elas- pounds per 

 ticity. () cubic 

 inch, (r) 



Pounds. 

 1,760,000 



1, 320, 000 



6.54 



4.11 



Mark. 



Longleaf pine : 



3 



3 



1 



White pine : 



116 



1 



3 



Crushing endwise. 



Crushing across grain. 



Dimensions. 



Height 



Inchet. 



Cross 

 section. 



Inchet. 

 3.46 

 3.72 



3.73 

 3.73 



Area. 



Crushing 

 load. 



Sq. in. 

 12. 87 



13.91 



Pounds. 

 77,700 



48,400 



Strength Dimensions. 



per 



Poundt. Inches. 



6,040 



3,480 



3.73 



3.72 



Cross 

 section. 



Inches. 



3.47 

 3.93 



3.72 

 3.93 



Area. 



Crushing 

 load. 



Sq.inch. 

 \ 13.63 



} 14.62 



Pounds. 

 10,400 



5,200 



Strength 



per square 



inch. 



Poundi. 



760 



Mark. 



Longleaf pine: 



White pine : 



116 



1 



3 



Tension testa. 



Shearing tests. 



Size of re- ,.,., .,1;,, i Strength Total Breaking Shearing 

 dncedsec- Area. 'per square shearing ]oad s strength, 

 tiou. inch. area. 



Sq.inch. Sq.ineh. 

 2.38 j 97g 





2.52 

 .45 



1.134 



Pounds. 

 11,400 



11,200 



Pounds. Sg. inch. 

 11,680 { 



4.16 

 4.02 



Pounds. 



2,280 

 2,580 



1,700 

 1,600 



Pounds. 



551 

 650 



409 

 398 



