xx. ] INDIAN TEAK. 
I2T 
test the deflections of Teak under 
various distances, viz. :— 
given weights at 
TaBLE XLIV. 
Nos. 1 to 6. 
Specimen, 2 x 2 X 84 inches, supported on props, |3ft.,| 4 ft., 5ft., |6 ft. apart. 
Weighted with 300lbs., the deflections were |‘065| °300 | °750 |1‘250ins. 
” ” 40olbs., ” 2 *300 “600 | 1 “150 2"050 ” 
Specimen, 
2 deep x 1% broad X 84 inches, supported on props, 3ft.., 4ft., | sft, 6 ft. apart. 
Weighted with 300lbs., the deflections were |'300| "400 | 1°100 |2*rooins. 
55 »  400lbs., xy a9 "400; ‘800 | 1°500 |2°800 ,, 
This piece, tried the other way, viz.:— 
14'' deep x 2’' broad, supported on props, | 3ft.,| 4 ft., 5ft., |6 ft. apart. 
Weighted with 300lbs., the deflections were |"200| *800 | 1°600 |3°200ins. 
5 >»  400lbs., 3 jp (aes 1200 | 2°600| Broke. 
The specific gravity of these pieces was respectively 
“586 and 631; a proof that they were thoroughly 
seasoned. Upon the laws which govern these deflections, 
I offer no opinion, and the experiments are merely 
introduced here to show how near the results go to 
confirm Professor Barlow's theory that the strength varies 
as the cubes of the length. 
There is one other species of trial which it may be 
well to mention, namely, that to ascertain the elongation 
