TESTS OP WESTERN YELLOW PINE CAR SILLS, ETC. 9 



Table 9. — Ratio of average strength values in bending for joists to small clear 



pieces cut from them. 



Seasoning and size. 



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- 

 ticity per 

 square 

 inch. 



As 

 tested. 



Oven 



dry. 



Green: 



2"xl0"xl6' 



46 



17.3 



Per cent. 

 35.8 



Pounds. 

 35.7 



Pounds. 

 26.4 



Pounds. 



2,830 



80 



3,530 



100 



4,502 



68 



6,622 



100 



Pounds. 



4,272 



77 



5,560 



100 



6,640 



60 



11,045 



100 



Thou- 

 sands of 

 pounds. 

 1,266 

 110 



2"x2"x30" 



91 



16.5 



33.4 | 35.8 



26.9 



1,149 



100 



Air seasoned: 



2"xl0"xl6' 



33 



16.7 



13.2 31.6 



28.5 



1,595 

 99 



2"x2"x30" 



58 



17.1 



11.7 30.9 



27.6 



1,611 



100 









1 







Table 10. — Results of tests in compression perpendicular to grain on clear speci- 

 mens, 5-inch by 8-inch by 20-inch, taken from western yellow pine car sills. 





Num- 

 ber 

 of 



tests. 



Rings 

 per 

 inch. 



Moisture. 



Weight per cubic 

 foot. 



Compres- 

 sive 

 strength 





As 

 tested. 



Oven 

 dry. 



at elastic 



limit per 



square 



inch. 



Green: 



Average 



25 



1 

 1 



26 



1 

 1 



15.6 

 21.5 



9.7 



13.3 



20.0 



8.0 



Per cent. 

 42.9 

 69.8 

 26.9 



13.0 

 17.4 

 11.5 



Pounds. 

 36.8 

 45.8 

 31.2 



30.5 

 40.7 

 24.1 



Pounds. 

 25.6 

 28.7 

 21.1 



27.0 

 34.6 

 21.5 



Pounds. 

 299 





413 



Minimum 



179 



Air seasoned: 



701 





1,110 



Minimum 



315 







