On the strength of Pine and Spruce Timber. 



231 



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



facts connected therewith . 





-a 

 o 



o 



"3 



a 

 2 





• 





"S 





^o 





o 



f 



ftpflfl 



>» 



Xi 





a 



*s 



a 



— 



rt 



feD 



Km 



O 



a 



^j 



£ 



*C 



*o 



fc£> 



CJ 



4) 



c/T 



* 



0) 



s 



^ 



« 1 



£ 



455 28,43 



o 



c» 



- 



w 



.490 



30.63 



o 



(/2 



.87: 



54.5 



rt 



i 



cs 



-8 



ctf 



3J 



5 2 



— * o 



Q 



a 

 o 



- 



o 



/. 



a> 



2 



c 



> 



o 



.S fcD 



O 



* 



L 



3 2 



1 



4 

 _2_ 

 4 

 J* 



4 



4 



4 



I 



3 2 

 t 



4 



_2 

 4 



3 

 4 



J 



4 a 



0.022 

 0.177 

 0.355 

 0.532 

 0.710 



3 2 

 1 



i 5 



•» 



4 

 _3 

 4 

 _4 

 4 0" 



d 



0.022 

 0.177 

 0.355 

 0.532 

 0.710 



121 



777 



1485 



2108 



2701 





C3 







o 



99 



o 



a 



3 



a c 



o o 



a 

 >,2 



~ CO 



§ a- *- 



- r/ — 



o£ x 



3'rflO 



o 

 CJ 



II 



c 



.- 



r» 



X 





134 



892 

 1613 

 J291 

 J966 



777 i a = 0.0116811 



708 



623 



593 



0.022 

 0.177 

 0.355 

 0.532 

 0.710 



8'J2 

 721 

 678 

 675 



(£=0.0101751 



1175 



218 



1175 



2218 il043 



974 



3192 



4111 



/ 



919 

 g 



a = 0.0077244 



h 



REMARK - . 



BxD 3 



In the expression for stillness, — _ ^ =\V, (col. A,) 



flxL 3 



(B) repr* nts the breadth in inches, 



(D) the depth in incites, 



(L) the bearing length in feet, and 



(W) the weight. 



The constant (a) has only been calculated for a deflexion of T ' u th 

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

 be exceeded in practice ; but if any other 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 

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

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



