120 TIMBER AND TIMBER TREES.  [cuap. 
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 390lbs., 1°791 inch, and with 
the breaking weight of 878 lbs., 5916 inches. From 
these results it appears, by the application of the formule 
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 lbs. 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 
3 X 3, varying by 1 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 
4% 4, and severally varying by 1 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 6 x 6, 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 9 x 9\%4, varying by 3 to 6 inches from 
12 to 30 inches in length, the strongest of which, 21 inches 
in length, took 3686 tons to cripple it; the details of 
these will, however, appear in Tables XLVIII. and 
XLIX. 
The following experiments were made in order to 
