XXXV.] 
PITCH PINE. 
289 
Table CLV. —Pitch Pine (American). 
Transverse Experiments.—yd Example. 
(Butt to top, outer part of the tree. Fig. 32 b.) 
Number 
of the 
specimen. 
Deflections. 
Total 
weight 
required 
to break 
each 
piece. 
Specific 
gravity. 
Weight 
reduced 
to 
specific 
gravity 
600. 
Weight 
required 
to break 
1 square 
inch. 
With the 
apparatus 
weighing 
390 lbs. 
After the 
weight 
was 
removed. 
At. . 
the crisis 
of 
breaking. 
Inches. 
Inch. 
Inches. 
lbs. 
lbs. 
13 
II 5 
•00 
375 
i >°35 
840 
740 
25875 
14 
I ’ I 5 
•15 
275 
9S5 
788 
725 
221‘25 
15 
I 'OO 
•00 
5-00 
I,IIO 
760 
876 
277-50 
16 
1-25 
•is 
375 
920 
655 
843 
230-00 
17 
1-25 
•00 
475 
925 
613 
905 
23I-25 
18 
I *35 
•20 
475 
845 
6lO 
831 
211-25 
Total . 
7 -i 5 
• 5 ° 
24 75 
' 5.S20 
4266 
4920 
I > 43 ° 
Average 
1 -191 
■0833 
4 - i 25 
970 
711 
820 
238-33 
Remarks. —No. 13 broke short and split; 14, curl in the grain and broke short; 15 
and 16 broke short and split; 17 and 18 broke with short fracture. 
E = 815070. S = 2546. 
Specimens Nos. 13 to 18, with the later layers or 
growth, were taken from the outside of the same plank, 
the object being to ascertain in the two sets of experi¬ 
ments—Tables CLIV. and CLV.—in which part of the 
length the maximum of strength lay. Table CLIV. 
shows that in the early layers it is in specimen 8, the 
second piece from the butt-end ; and Table CLV. 
shows that in the wood of later growth it is in speci¬ 
men 15, the third piece from the butt-end. We also 
see in the mean results of the experiments that the 
strength of the inner is to the outer wood as 889 :970. 
Further experiments on the transverse strength of 
the inner and outer layers of wood of another Pitch Pine 
tree were then carried out, with the following results :— 
u 
