14 



BULLETIN 497, U. S. DEPARTMENT OF AGRICULTURE. 



in strength in any wood, the gain is somewhat greater for small, clear 

 pieces than for timbers in structural sizes. Seasoning does not, as 

 a rule, cause any appreciable defects in small pieces, but in large 

 beams often develops defects in the form of checks which counter- 







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Glee's? 



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| g <■ t. k l VI 



\3ff.o, 



<3e./ 



^g 



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Fig. 4. — Summary of moisture determinations made upon green and seasoned joists and 

 car sills of western yellow pine. 



balance the strength gained in seasoning. A comparison of the 

 strength values of green and air-seasoned car sills is given in figure 1. 

 The effect of seasoning upon the strength of test material of various 

 sizes is indicated in Table 12. 



