BULLETIN 286, IT. S. DEPARTMENT OP AGRICULTURE. 



7ested/5Jrectfy after /ft?at/ne/)f 



s4/rfir/edar>d7ested 



■IBE/f~STA£SS 



*- * r , ■ ■ 

 £l«sr/c l/rt'T 



Afoottit/s 



Or~ 



fzstsr/c/ry 



O— O TR£AT£D 



7* = Tops 



Fig. 4.— Effect of preservative treatment on the strength and stiffness of longleaf-pine stringers treated 



partially dry. 



14 IS 16 17 18 13 20 

 BeAM NUMBER 



« • naruHAL O— O THCirED (boiling f/ioeeaaj 



3 • Butts r- Tops 



■Effect of "boiling process" of preservative treatment on the strength and stiffnessof Douglas-nr 

 stringers treated green and t< bed without se is tning. 



