18 



SAFE LOADS IN POUNDS 

 FOB RECTANGULAR 

 OF WHITE OAK AND 



Allowable fibre itress 1 200 pounds per square inch. Safety factor 6. 

 Safe loads for other safety factors may be obtained as follows : 



Safe load* for beams of Douglas Fir, Red Pine (No 

 and California Spruce, % of abor. 



y Pine). Cypress, Chestnut 



