CHAP. IX.] BRITISH OAK. 51 
TABLE VI.—ENGLISH OAK. 
Transverse Experiments.—Second Example, 
Deflections. Total Weight q 
: a Weight 
weight 2s {reduced B 
Number | with the | Afterthe| At required | ‘S| to | required 
specimen apart weight | the crisis | to ai a8 | specific Pequare 
‘| weighing was ° eacl wba | gravity . 
390 Ibs. | removed. | breaking. ! piece. 1000. inch. 
Inch. Inch. Inch. Ibs. Ibs, 
7 1°625 "125 4°125 674 780 | 864 | 168:50 
8 1025 250 | 5:20 837 753 | 1112 | 209'25 
9 1°500 187 5000 824 770 | 1070 | 206°00 
bo) 1625 "125 9°500 17 1005 | 972 | 244°25 
II 1750 “000 9'250 82 1003 | 879 | 220°50 
12 1°500 000 8°750 827 1002 | 825 | 200°75 
Total .| 9°625 687 | 41°875 | 5,021 5313 | 5722 |1255°25 
| Average| 1°604 | "114. | 6°979 837 886 | 954 | 209°21 
| E = 605950. S = 21097. 
Remarks.—No. 7 broke short : 8 and 12 with 7 to 13 inches length of fracture ; 9, 
ro, 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 I1‘oo inches, 
and 4°125 to 9°50 inches, respectively; while the break- 
