co 



(M 



S 



"b 



3 



=! 

 O 



Failed at a knot. 



Oblique grain. 



co oo --^ -rf "~. 



! Oblique grain. 



o <~ 

 o 



C: C= CC 



ot 



s 







c 

 o 



a 

 _o 



'53 

 a 



: : *. : ! Failed at a knot J ~ ^ ^ 



in in dinniptr-v *~* '~ : 



^ O O 





Failed at a km- 





i c^j re cc M- 



OC>OQO 'tOO^fOOCCO 

 O 'f-C^OCMCC-*^O>JQO 



it (M rc o ir> i- a,' Jj ^ 





-etnn | : : : : ; ; : : : : :*nS ?! S 



O O ^H OD <>J OO CH 



o ^- : -= -/ > '" -f '-o o 

 tooocoO' i -^ cc cc o eo 



t- - 



- 

 -: - i- r cs =^ ]-\ a it ur e largely due to 



O 



3 



92 



