Bui. 552, U. S. Dept. of Agriculture. 



Plate V. 



■ ■ si ■?«•'■ 



:'- : "-, 



BHbP* 8 ^- "' 



"' " , - g| 





5S 



. . 



Fig. 1.— Sun Shields Used to Reduce Checking in Thick Red Oak Timber. 



Fig. 2.— Lumber Piled so as to Form "Chimney" or Flue near Center of Stack 

 from Bottom to Top. 



