120 TIMBER AND TIMBER TREES. [CHAP. 



ference is against the specimens tried in England, but 

 this may be attributed mainly to the more seasoned state 

 of the pieces, and, perhaps, in part, to better appliances 

 for testing. 



The mean deflections of the twelve pieces referred to, 

 were, when weighted to 390 Ibs., 1*791 inch, and with 

 the breaking weight of 878 Ibs., 5*916 inches. From 

 these results it appears, by the application of the formulae 

 used by Professor Barlow, that the strength is represented 

 by 2303, and the elasticity by 530970. The same pieces 

 being tested for tensile strength, took a strain nearly 

 equal to 6 tons to overcome the direct cohesion, or about 

 3,301 Ibs. to the square inch. 



A number of cubes of this timber were subjected to 

 a crushing force in the direction of the fibres, and these 

 generally gave way under a pressure of about 2^ tons 

 per superficial inch of base. Altogether, some fifty- 

 three experiments of this kind were made upon Teak, 

 four being on pieces 2 X 2 of various lengths, others were 

 3X3, varying by I inch from 8 to 18 inches in length, 

 the piece of 16 inches proving to be the strongest, and 

 taking 28*75 tons to crush it; then there were pieces 

 4X4, and severally varying by I inch from 15 to 24 

 inches in length, the piece of 20 inches proving to be 

 the strongest, and taking 42 tons to crush it. Again, 

 there were pieces 6x6, and severally varying by 3 inches 

 from 12 to 30 inches in length, the piece 18 inches in 

 length taking 174 tons to crush it ; and finally, there 

 were other pieces 9X9j{, varying by 3 to 6 inches from 

 1 2 to 30 inches in length, the strongest of which, 2 1 inches 

 in length, took 368*6 tons to cripple it; the details of 

 these will, however, appear in Tables XLVIII. and 

 XLIX. 



The following experiments were made in order to 



