12 



BULLETIN 497, U. S. DEPARTMENT OF AGRICULTURE. 



7000 

 6000 

















































28^. 



42 



-^^6 











5000 





















MO0ULU3 of RUPTURE 



LBS. re* 30. IN. 



2*2"><30" BEAM5 



128 TESTS 





















4000 









































3000' 











27 



4 









CRUSHING STRENGTH 



at MAX. LOAD 



LBS. per SQ.lN. 



COMP.// TO GRAIN 



a*&Q-\4Z TESTS 





8 



15 

 Z5Q 



26 







e 





^2 



2000 















































& 



-OT 



10 

 ^-0 



IO 



.^^ 3 







MODULUS or ELASTICITY 



IOOO LBS. pen 3Q.IN. 



2'*2*30' BEAMS 



137 TESTS 



IOOO 



14 























OOO 









































28 

 26 





















DRY WEIGHT 



LBS. pc« CU.FT. 



SMALL CLEAR STICKS 



136 TESTS 





























28 



















15 



v - 



24 



























2b rf 



42 













ZZ 

























6 

















ZO 









































O -4-6 12 10 20 24 28 32 



RATE or 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. 



