8 BULLETIN 497, U. S. DEPARTMENT OF AGRICULTURE. 



Table 7. — Results of tests in compression parallel to grain on clear specimens 

 taken from western yellow pine joists. 



Seasoning and size of sticks. 



Number 

 of 



tests. 



Rings 

 per 

 inch. 



Moisture 



Weight per cubic 

 foot. 



As 



tested. 



Oven 

 dry. 



Green, 2 by 2 by 8 inches: 



Average 



Maximum 



Minimum 



Air seasoned, 2 by 2 by 8 inches 



Average 



Maximum 



Minimum 



16.5 



41.0 



7.0 



16.5 



28.0 

 8.0 



Per cent. 

 36.5 

 182.7 

 20.2 



11.0 

 21.7 



6.8 



Pounds. 

 35. 5 

 61.9 

 26.2 



30.3 

 38.3 

 22.8 



Pounds. 

 26.2 

 41.4 

 17.2 



27.5 

 34.4 

 20.2 



Table 8. — Ratio of average strength values in oending for all and separate 

 grades of car sills to small clear pieces cut from them. 



Seasoning, size, and 



Num- 

 ber 



of 

 tests. 



Rings 

 per 

 inch. 



Moisture. 



Weight per cubic 

 foot. 



Fiber 

 stress at 

 elastic 

 limit per 

 square 

 inch. 



Modulus 

 of rup- 

 ture per 

 square 

 inch. 



Modulus 

 of elas- 



grade. 



As 



tested. 



Oven 

 dry. 



ticity per 

 square 

 inch. 



Green: 



Select— 



5"x8"xl6'.... 



6 



18.0 



Per cent. 

 50.7 



Pounds. 

 38.0 



Pounds. 

 25.2 



Pounds. 



3,167 



98 



3,229 



100 



2,828 



89 



3,172 



100 



2,432 



79 



3,089 



100 



2,769 



88 



3,156 



100 



4,020 



59 



6,791 



100 



4,136 



62 



6,722 



100 



3,552 



54 



6,584 



100 



3,976 



59 



6,681 



100 



Pounds. 



4,910 



80 



6,108 



100 



4,745 



82 



5,815 



100 



4,100 



72 



5,704 



100 



4,560 



78 



5,831 



100 



6,260 



61 



10, 200 



100 



6,395 



58 



10,944 



100 



5,546 



52 



10, 687 



100 



6,119 



57 



10, 751 



100 



Thou- 

 sands of 

 pounds. 

 1,455 

 114 



2"x2"x30"... 



12 



15.5 



38.9 



38.4 



25.9 



1,281 

 100 



Merchantable— 



5"x8"xl6'.... 



11 



15.3 



37.1 



36.1 



26.4 



1,224 

 106 



2"x2"x30".... 



22 



15.0 



36.3 



35.5 



26.0 



1,156 

 100 



Common- 

 s'' x 8" x 16'.... 



9 



14.4 



34.6 



33.6 



25.1 



1,125 

 99 



2"x2"x30".... 

 Percent. . .. 



18 



14.3 



33.6 



33.3 



24.9 



1.142 



100 



All grades— 



5"x8"xl6'.... 



26 



15.6 



39.3 



35.7 



25.7 



1,243 



106 



2"x2"x30".... 



52 



14.9 



36.1 



35.5 



25.6 



1,178 

 100 



Air dry: 

 Select — 



5"x8"xl6' 



3 



16.6 



12.7 



29.9 



26.5 



1,614 

 112 



2"x2"x30" 



6 



14.2 



12.0 



28.5 



25.4 



1,434 

 100 



Merchantable: 



5"x8"xl6'.... 



13 



14.8 



12.6 



30.6 



27.2 



1,503 

 103 



2"x2"x30".... 



22 



14.4 



11.6 



30.3 



27.1 



1,474 

 100 



Common— 



5"x8"xl6' 



7 



15.1 



12.5 



30.6 



27.2 



1,514 



105 



2"x2"x30".... 



14 



13.1 



11.2 



29.6 



26.6 



1,448 

 100 



All grades— 



5" x8"xl6' 



23 



15.2 



12.6 



30.6 



27.2 



1,521 

 104 



2"x2"x30".... 



42 



13.9 



11.5 



29.9 



26.7 



1,459 

 100 

















