Moduli of Rigidity for Spruce. 859 



An examination of the means from Tables I., II., and III. 



•esulted in the curves shown in fig. 6. 



Fig. 6. 

 5000 



0,> 



•le^ooo 



.c: 



^-3000 

 'A 



<0 



I 



^2000 

 N 1000 



Is 



h 



<0 











51> 

















X 



/ 



o^ 





















































I 







t 











/ 

















10 20 30 



Density Dry (lbs. per cu. ft) 



Here S'# and Sy denote respectively the shrinkages in the 

 directions XOX and YOY per unit length of dry timber, 



