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. 



X umber 



of 



tests. 



Rings 

 per 

 inch. 



Moisture. 



Weight per cubic 

 foot. 



As 

 tested. 



Oven 

 dry. 



Crushing 

 strength 

 at max- 

 imum 

 load per 

 square 

 inch. 



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 



10.5 



28.0 



8.0 



Per cent. 

 30.5 

 182.7 

 20.2 



11.0 



21.7 



0.8 



Pounds. 

 35.5 

 61.9 

 20.2 



30.3 

 38.3 

 22.8 



Pounds. 

 20.2 

 41.4 

 17.2 



27.5 

 34.4 

 20.2 



Pounds. 

 2,098 

 3,900 

 1,870 



0,559 

 8,500 

 4,100 



Table S. — Ratio of average strength values in bending for all and separate 

 grades of ear 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. 



square 

 inch. 



Green: 



Select- 

 s'' x 8" x 10'.... 







18.0 



Per cent. 

 50.7 



Pounds. 

 38.0 



Pounds. 

 25.2 



Pounds. 



3,107 



98 



3,229 



100 



2,828 



89 



3,172 



100 



2,432 



79 



3,089 



100 



2,709 



88 



3,150 



100 



4,020 



59 



0,791 



100 



4,130 



02 



0,722 



100 



3,552 



54 



6,584 



100 



3,970 



59 



G,G81 



100 



Pounds. 



4,, 910 



80 



0,108 



100 



4,745 



82 



5, 815 



100 



4,100 



72 



5,704 



100 



4,500 



78 



5,831 



100 



6, 2G0 



01 



10, 200 



100 



G,395 



58 



10,944 



100 



5,546 



52 



10,687 



100 



0,119 



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"xl0'.... 



11 



15.3 



37.1 



30.1 



20.4 



1,224 

 100 



2"x2"x30" 



22 



15.0 



30.3 



35.5 



20.0 



1,150 

 100 



Common — 



5"x8"xl0'.... 



9 



14.4 



34.0 



33.0 



25.1 



1,125 

 99 



2"x2"x30".... 



18 



14.3 



33.0 



33.3 



24.9 



1.142 

 100 



All grades — 



5"x8"xlG'.... 



20 



15.0 



39.3 



35.7 



25.7 



1,243 

 100 



2"x2"x30" 



52 



14.9 



30.1 



35.5 



25.6 



1,178 

 100 



Air dry: 

 Select- 

 s'' x 8" x 10'.... 



3 



10. 



12.7 



29.9 



20.5 



1,014 

 112 



2"x2"x30".... 







14.2 



12.0 



28.5 



25.4 



1,434 

 100 



Merchantable: 



5"x8"x 10' 



13 



14.8 



12.0 



30.0 



27.2 



1,503 

 103 



2"x2"x30".... 



22 



14.4 



11.0 



30.3 



27.1 



1,474 

 100 



Common — 



5"x8"xl0'.... 



7 



15.1 



12.5 



30.0 



27.2 



1,514 

 105 



2"x2"x30".... 



14 



13.1 



11.2 



29.0 



20.0 



1,448 

 100 



All grades— 



5"x8"xl6' 



23 







15.2 



12.6 



30.0 



27.2 



1,521 

 104 



2"x2" x :!()".... 



42 



13.9 



11.5 



29.9 



20.7 



1,459 

 100 

















