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



7000 

 6000 

 5000 





















" 







16* 



Zd , 



42 











MODULUS of RUPTURE 



LBS. per SQ.IN. 



2*2*00" BEAM5 



128 TE5T5 

















VS 





4000 

 SOOO' 































R 



4 









CRUSHING STRENGTH 



at MAX. LOAD 



LBS. per SQ.IN. 



COlvF.// TO GRAIN 



2'x2'x8'-l42 TESTS 





g 



& 



If* 



^o 





6 





.2 



2000 













































6 



25^ 



33 14 



g 



IO 



^^ 3 







MODULUS or ELASTICITY 



IOOO LBS. re* SQ.IN. 



2* 2* 30' BEAMS 



137 TESTS 



IOOO 



14 























000 









































28 

 26 





















DRY WEIGHT 



LBS. pes CU.FT. 



SMALL CLEAR STICKS 



136 TESTS 





























23 









T 



24 









15 



y - 







yt 



'^ 













ZZ 





/ 



/ 























6 

















ZO 































































O 4 6 12 16 20 24 28 32 



RATE of GROWTH- RINGS per INCH 



Fig. 2. — Relation of density and strength values to rate of growth in small, clear 

 pieces of green western yellow pine. 





