CHAP. IX.] 
BRITISH OAK. 
5i 
Table VI. —English Oak. 
Transverse Experiments.—Second Example. 
Number 
of the 
specimen. 
Deflections. 
Total 
weight 
required 
to break 
each 
piece. 
Specific 
gravity. 
Weight 
reduced 
to 
specific 
gravity 
1000. 
Weight 
required 
to break 
1 square 
inch. 
With the 
apparatus 
weighing 
390 lbs. 
After the 
weight 
was 
removed. 
At 
the crisis 
of 
breaking. 
Inch. 
Inch. 
Inch. 
lbs. 
lbs. 
7 
1-625 
•I25 
4*125 
674 
780 
864 
168-50 
8 
1-625 
•250 
5 ‘250 
837 
753 
1112 
209-25 
9 
I-500 
•187 
5-000 
824 
770 
IO70 
206 "OO 
10 
1-625 
•125 
9-500 
977 
1005 
972 
244-25 
11 
1-750 
•OOO 
9-250 
882 
1003 
879 
220-50 
12 
1-50° 
•OOO 
8750 
827 
1002 
825 
206-75 
Total . 
9-625 
•68 7 
4 i - 875 
5,021 
5313 
5722 
1255-25 
Average 
I '604 
•114 
6-979 
837 
886 
954 
209 -21 
E = 605950. 
S = 2197. 
Remarks.— N0.7 broke short : 8 and 12 with 7 to 13 inches length of fracture ; 9, 
10, and 11 with 15 inches scarph-like splintery fracture. 
The Tables V. and VI. each refer to parcels of six 
pieces, which were taken from trees of good average 
quality and size, moderately seasoned, and fit to be 
applied to architectural works, the specific gravity vary¬ 
ing from 670 to 905 in one set, and 780 to 1005 in the 
other. Of the twelve pieces tested, the elasticity of two, 
after the weight of 390 lbs. was removed, was perfect. One 
piece recovered its straightness to within '312 inch, 
while of the remainder, nine in number, the elasticity 
was in all something better, though not quite perfect. 
The deflections varied under this weight of 390 lbs. 
from 3'125 to 3"625 inches in one set, and from 1-5 to 
1 '75 inch in the other, the ultimate deflections at the 
crisis of breaking varying from 5‘25 to iroo inches, 
and 4*125 to 9*50 inches, respectively; while the break- 
