Page:Timber and Timber Trees, Native and Foreign.djvu/344

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Table CLXVII.— Non 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.
1	2.00	375	700	643	175.00
2	2.50	5.00	770	650	192.50
Total	4.50	8.75	1470	1293	367.50
Average	2.25	4.375	735	646.5	183.75
4	2.75	4.15	485	1064	121.25	$\scriptstyle {\left.{\begin{matrix}\ \\\\\ \\\ \\\ \\\ \\\ \ \end{matrix}}\right\}\,}$	Kept in a box of manure.
5	3.50	4.50	420	1085	105.00
6	3.50	4.35	440	1090	110.00
Total .	9.75	13.00	1345	3239	336.25
Average	3.25	4.33	448.33	1079.66	112.08

Remarks.—No. 1 broke with scarph-like fracture, 7 inches in length; 2 broke in three pieces, each scarph-like, 7 inches in length; 4 broke with scarph-like fracture, 14 inches in length; 5 broke rather short, with small splinters; 6 broke with scarph-like fracture, 8 inches in length.

All the specimens that were kept dry, whether carbonised or not, were apparently in good condition; but those which had been placed in manure or damp earth, were more or less in a state of decomposition, the softer parts of the concentric layers being slightly wasted away with rot on the surface. The difference in strength between the carbonised and non-carbonised pieces was not very great, but the tables show that of the pieces kept dry, the loss of strength was greatest by about 8 per cent, in the carbonised specimens; and of those kept in manure, the loss was about per cent, in excess on the non-carbonised pieces. When the experiment for testing the strength was completed,