IX.] 
BRITISH OAK. 
53 
of this tree, came out with a long, clean, straight grain, 
• as the appearance of the log had promised; but the six 
taken from the opposite side were not nearly so good, 
the grain being in each a little waved or twisted, and the 
fibre of no great length. Some had small pin-like knots 
in them, and the surface of the plank being dotted over 
with these, it presented a mottled appearance, somewhat 
resembling Bird's-eye Maple. 
The specimens are numbered from the centre or pith 
of the tree outwards—i to 6 and T to 6' in column 9. 
The results are as follow, viz. :— 
Table VII. 
Transverse Experiments. —3 rd Example. 
Deflection. 
a: 
C 
O _• 
— 
Number of th 
specimen. 
j With the appa- 
i ratus weighing 
1 390 lbs. 
i At the crisis of 
breaking. 
Total weight 
required to bre 
each piece. 
Specific gravit; 
Total weight 
required to bre; 
1 square inch. 
Direct cohesion 
the square inch 
Number of the s 
cimen in the tre 
The mean of 1' 
to 6' . . . 
Inches. 
3‘25 
Inches. 
3’95 
lbs. 
407 
867 
lbs. 
101-75 
lbs. 
13 
375 
375 
390 
836 
97‘5 
6' 
14 
375 
375 
400 
866 
100-O 
5' 
15 
37o 
390 
868 
97-5 
4' 
16 
390 
865 
97-5 
3' 
English 
17 
375 
390 
860 
97-5 
2 ' 
18 
2-25 
5'°° 
480 
910 
120 -O 
1 ' 
Oak. 
19 
2 "OO 
7-00 
740 
900 
185-0 
5,320 
1 
20 
2 '00 
4'5° 
630 
900 
1577 
4,400 
2 
21 
2-25 
5'°° 
620 
854 
155-0 
4,200 
3 
22 
3'5° 
4'5o 
470 
864 
II7-5 
4,340 
4 
23 
375 
5-00 
480 
838 
I20‘0 
2,520 
5 
24 
4’oo 
4‘5o 
43° 
791 
I 07-5 
2,240 
6 
The mean of I to 6 
2 - 916 
5-10 
562 
CO 
TO 
00 
I 40-5 
3,837 
The mean of the whole 
3 ’083 
4725 
484 
862-5 
121 
Remarks.—N os. 13 to 17 inclusive broke very short; 18 and 19 were nearly alike 
and had scarph-shaped fractures 10 inches in length ; 20 and 21 had long splintery frac¬ 
tures ; 22 to 24 inclusive broke short to %th the depth, then long fractures. 
