XX.] 
INDIAN TEAK. 
I 2 I 
test the deflections of Teak under given weights at 
various distances, viz. :— 
Table XLIV. 
Nos. i to 6. 
Specimen, 2 x 2 X 84 inches, supported on props, 
3 ft-, 
4 ft-, 
5 ft., 
6 ft. apart. 
Weighted with 30olbs., the deflections were 
„ ,, 40olbs., ,, ,, 
•065 
•300 
•300 
•600 
0 0 
i - 25oins. 
2-050 „ 
Specimen, 
2 deep x i l A broad X 84 inches, supported on props, 
3 ft-, 
4 ft-, 
5 ft-, 
6 ft. apart. 
Weighted with 3oolbs., the deflections were 
,, „ 400 lbs., ,, ,, 
0 0 
0 0 
rO rj- 
•4OO 
•800 
I -ioo 
I-500 
2‘looms. 
2 - 8oo ,, 
This piece, tried the other way, viz.:— 
1 %" deep x 2 “ broad, supported on props, 
3 ft., 
4 ft., 
5 ft., 
6 ft. apart. 
Weighted with 30olbs., the deflections were 
„ „ 400 lbs., ,, ,, 
O O 
O O 
Cd tO 
•800 
1-200 
i‘6oo 
2‘6oo 
3-200 ins. 
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 
