Page:Timber and Timber Trees, Native and Foreign.djvu/343

---

---

I examined these specimens in 1863 and 1864, and they all appeared to be as strong and sound as when first prepared; they were therefore returned to their places. I again examined them in 1867, and then tested them for transverse strength. The results are given in the following tables :—

Table CLXVI.—Carbonised British Oak.

Number of the specimen.	Deflections.		Total weight required to break each piece.	Specific gravity.	Weight required to break 1 square inch.
	With the apparatus weighing 390 lbs.	At the crisis of breaking.
	Inches.	Inches.	lbs.		lbs.	$\scriptstyle {\left.{\begin{matrix}\ \\\\\ \\\ \\\ \\\ \\\ \ \end{matrix}}\right\}\,}$	Kept dry in the store-room.
03	2.45	4.45	660	626	165.00
10	2.55	4.55	690	622	172.50
Total	5.00	9.00	1350	1248	337.50
Average	2.50	4.50	675	624	168.75
7	3.00	4.25	345	1036	86.25	$\scriptstyle {\left.{\begin{matrix}\ \\\\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \ \end{matrix}}\right\}\,}$	Kept in a box of manure.
8	3.50	5.00	490	1095	122.56
9	3.25	575	530	1080	132.50
Total	9.75	15.000	1.365	3211	341.25
Average	3.25	5.00	455	1070	113.75
11	—	—	—	—	—
12	2.75	4.50	480	946	120.00

Remarks.—No. 3 broke with scarph-like fracture, 5 inches in length; 10 broke in three pieces, each with scarph of 6 inches ; 7 broke with long splintery fracture ; 8 broke with splinters, 12 inches in length; 9 broke with splinters, 9 inches in length; 11, lost; 12 broke off short in three pieces.