12 



BULLETIN 286, U. S. DEPARTMENT OP AGRICULTURE. 



Table 2. — Strength and stiffness of small pieces — natural and treated — cut from the inside 

 and outside portions of longleaf pine, loblolly pine, and Douglas fir stringers. 



Species, condition, and 

 locality. 



Number 

 oftests. 



Moisture 

 (per cent). 



Rings per 

 inch. 



Modulus 



of rupture 



(pounds per 



square inch). 



Fiber stress Modulus 



of elastic of elasticity 



limit (1,000 



(pounds per pounds per 



square inch), square inch). 





N. 



T. 



N. 



T. 



N. 



T. 



N. 



T. 



N. 



T. 



N. 



T. 



Longleaf pine: 



Partially air dry- 

 All 



28 



24 

 4 



23 



IS 



29 



24 



5 



23 

 17 



6 



28 



22 



6 



26 



21 



5 



38 

 19 

 19 



54 

 27 

 27 



21.5 

 21.0 

 24.6 



12.8 

 13.0 

 12.6 



20.3 

 19.8 

 22.2 



12.0 

 12.0 

 11.8 



30.1 

 29.6 

 30.6 



15.6 

 14.8 

 16.4 



27.5 



19.2 

 19.6 

 14.6 



19.9 

 20.2 

 18.5 



6.4 

 6.9 

 4.6 



7.2 

 7.6 

 5.7 



10.7 

 11.7 

 9.6 



13.2 



14.1 

 12.2 



18.3 

 19.3 



14.4 



19.6 

 18.1 

 14.2 



6.4 

 6.9 

 5.5 



7.4 

 7.6 

 5.8 



12.6. 



13.9 



11.4 



13.1 

 13.6 

 12.6 



9,507 

 9,455 

 9,978 



13,520 

 13, 109 



14,378 



8,605 

 8,599 

 8,592 



12,491 

 12,382 

 13,003 



7,923 

 8,041 

 7,805 



10, 608 

 10,929 

 10, 287 



9,036 

 9,046 

 8,870 



11,418 

 11, 208 

 11,495 



6,571 

 6,221 

 8,148 



12, 182 

 12, 122 

 12, 157 



6,216 

 6,862 

 5,571 



6,598 

 6,721 

 6,475 



5,623 

 5,587 

 5, 953 



8,070 

 8,060 

 8,153 



5,109 

 5,120 

 5,010 



7,502 

 7,434 

 7,713 



4, 450 

 4,407 

 4, 493 



6,546 

 6,953 

 6, 138 



5,365 

 5,376 

 5,088 



6,824 

 6,855 

 9,543 



3,531 

 3,294 

 4,560 



7,611 



7,644 

 7,145 



3,434 

 3,S97 

 2,971 



4,003 

 4,021 

 3,985 



1,493 

 1,485 

 1,581 



1,663 

 1,641 

 1,714 



1,350 

 1,339 

 1,365 



1,605 

 1,607 

 1,595 



1,595 

 1,617 

 1, 5S3 



1,778 

 1,787 

 1,770 



1,434 





1,428 





1,464 



Air drv — 



All 



1,508 





1,489 







1,527 



Loblolly pine: 



Partially air dry- 

 All.' 



30 



24 



6 



so 



1,104 





1,086 





1,289 



Air dry — 



All 



1,603 



Outside 



24 



1,609 

 1,550 



Douglas fir: 



Boiling process — 

 Green- 

 All 



48 

 24 

 24 



66 

 33 

 33 



1, 4S6 



Outside 



Inside 



Air drv- 

 AU 



Outside 



Inside 



Steaming process — 



Green — 



All 



1,570 

 1,401 



1,624 

 1,617 

 1,632 



Outside 



1 























.....:.:.. 





















Air dry — 



All 































































! 



i 







1 





1 





