422 



CAMBRIA STEEL. 



STRENGTH OF SOLID WOODEN COLUMNS OF 

 DIFFERENT KINDS OF TIMBER. 



For various values of -j-* 

 a 



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 F 700 + 15c 



A 700 + 15c + c 2 ' 

 P = ultimate strength in pounds per square inch. 



F = ultimate crushing strength of timber. c = =- 



Values of F are those given in table on pages 414 and 415 herein. 



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

 the above table, see p. 408. 



