CAMBRIA STEEL. 



423 



STRENGTH OF SOLID WOODEN COLUMNS OF 

 DIFFERENT KINDS OF TIMBER. 



For various values of -r- 

 d 



1 = length of column in inches, d = least diameter in inches. 

 BASED ON THE FORMULA OF THE U. S. DEPARTMENT OF AGRI- 

 CULTURE, DIVISION OF FORESTRY. 



p p y 7QQ + 15c 



F X 700 + 15c + c* ^ 

 ultimate strength in pounds per square inch. 



For safety factors for various classes of structures to be used in connection with 

 the above table, see p. 408. 



