Page:Timber and Timber Trees, Native and Foreign.djvu/303

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And of the tensile:

The pieces	1 and 1′,	s.g.	543,	broke with	1,925	lbs.
The pieces„	22′„	s.g.„	548,	broke with„	2,510	lbs.„
The pieces„	33′„	s.g.„	559,	broke with„	2,450	lbs.„
The pieces„	44′„	s.g.„	563,	broke with„	2,152	lbs.„

We find here that the denser layers are at 4 and 4′, near the outside of the log, but we are not sure as to the amount of wood removed in hewing it, so that it may perhaps compare with the specimens in Table CXLIX. as to position of growth. It will be seen that the point of greatest transverse strength is at or near 3 and 3′, and that of the tensile at or near 2 and 2′.

There is a marked difference in the strength of the wood on the two sides of this tree, since 1, 2, 3, and 4 have a mean transverse strength of 556, and 1 , 2 , 3′, and 4′ of 453 only, the difference being 103, or about 18 per cent. This is further remarkable in the tensile strength, since 1, 2, 3, and 4 have a mean strength of 2599, and 1′, 2′, 3′, and 4′ of 1920 only, the difference being 679, or about 26 per cent.

Table CLI.
Tensile Experiments.

Number of the specimen.	Dimensions of the pieces.			Specific gravity.	Weight the piece broke with.	Direct cohesion on 1 square in.
	Inches.				lbs.	lbs.
36	$\scriptstyle {\left.{\begin{matrix}\ \\\\\ \\\ \ \end{matrix}}\right\}\,}$	2 × 2 × 30	$\scriptstyle {\left\{{\begin{matrix}\ \\\\\ \\\ \ \end{matrix}}\right.}$	464	7,280	1,820
37				444	7,840	1,960
38				506	9.205	2,301
Total	...			1414	24,325	6,081
Average	...			471	8,108	2,027