Bui. 552, U. S. Dept. of Agriculture. 
Plate V. 
Fig. 1.— Sun Shields Used to Reduce Checking in Thick Red Oak Timber. 
%j: m- r v;-,,-.. 
" ".-*■ - - 
. ; , ■ ; i ■':_'""— v. r: ''' ; ' ;; - :: \v - : •■•'-'.;.; : ' -fi 
W™^W*"»iMjJWiIIiM i ..pifliiSiiMlSiwr^^ll 
. ^ ^^^v , o; ?^B| j/ppPSR -^ 
Fig. 2.— Lumber Piled so as to Form "Chimney" or Flue near Center of Stack 
from Bottom to Top. 
