13 



to these values, for Class B, 8 per cent ; for Class C, 18 

 per cent and for Class D, 25 per cent. 



Based upon the above classification of structures, the 

 t\\<> following tables have been figured to facilitate calcu- 

 tions of allowable loads for wooden beams and columns. 

 Proportion of the values given in the "Tables of Safe 

 Loads for Wooden Beams," to be used in order to obtain 

 the safe loads for the various classes of structures referred 

 to al>ove. 

 Classes. Yellow Pine. All Others. 



Class A 1.00 1.00 



Class B 1.15 1.08 



Class C 1.40 1.18 



Class D 1.55 1.25 



Safety factors to be applied to the values given in the 

 table of "Strength of Solid Wooden Columns," in order 

 to obtain the safe loads for the various classes of struc- 

 tures referred to above. 



Classes. Yellow Pine. All Others. 



Class A 0.20 0.20 



Class B 0.23 0.22 



Class C 0.28 0.24 



Class D 0.31 0.25 



