70 TABLE 37. 



UNIT STRESSES FOR STRUCTURAL TIMBER 

 POUNDS PER SQUARE INCH. 



EXPRESSED IN 



Recommended by the Committee on Wooden Bridges and Trestles, American Railway 

 Engineering Association, 1909. 



These unit stresses are for a green condition of the timber and are to be used without increasing the live- 

 load stresses for impact. 

 * Partially air-dry. 

 t L = length in inches. D = least side in inches. 



SMITHSONIAN TABLES. 



