On the strength of Pine and Spruce Timber. 231 



Table (B.) Being a condensation of the results given in Table (A), with other 

 facts connected therewith. 



REMARKS. 



In the expression for stiffness, 



BxD = 



=W, (col. A,) 



axL^ 



(B) represents the breadth in inches, 



(D) the depth in inches, 



(L) the bearing length in feet, and 



(W) the weight. 



The constant (o) has only been calculated for a deflexion of j'^th 

 of an inch to one foot, as that is a limit which, generally, should not 

 be exceeded in practice ; but if any odier deflexion is desired, the 

 constant quantity proper for it may easily be obtained by substituting 

 in the above expression, for (L) 7.1, for (D) 5.5, for (B) 2.75, and 

 for (W) the weight in this table opposite the deflexion desired, the 

 value of (a) resulting, is the number of which we are in search. 



