450 



SELLING LUMBER 



of an inch in width on both sides, not exceeding 1 one-half the 

 circumference of the knot, it shall be considered a sound knot. 

 (See Sees. 10 and 17). (See page 454). 



14. An unsound knot is one not as hard as the wood it 

 is in. (See page 455). 



LARGE KNOT. 



PITCH. 



15. Pitch pockets are openings between the grain of the 

 wood containing more or less pitch or bark, and shall be classi- 

 fied as small, standard and large pitch pockets. 



