Page:Timber and Timber Trees, Native and Foreign.djvu/192

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Table LXXXIV.
Tensile Experiments.

Number of the specimen.	Dimensions of each piece.			Specific gravity.	Weight the piece broke with.	Direct cohesion on 1 square in.
	Inches.				lbs.	lbs.
7	$\scriptstyle {\left.{\begin{matrix}\ \\\\\ \\\ \\\ \\\ \\\ \ \end{matrix}}\right\}\,}$	2 × 2 × 30	$\scriptstyle {\left\{{\begin{matrix}\ \\\\\ \\\ \\\ \\\ \\\ \ \end{matrix}}\right.}$	752	19,040	4,760
8				765	19,824	4.956
9				817	15,120	3,780
10				720	11,200	2,800
11				771	10,640	2,660
Total	...			3825	75,824	18,956
Average.	...			765	15,165	3,791

 

Table LXXXV.
Vertical Experiments on cubes of—

Number of the specimens.	1 Inch.	2 Inches.	3 Inches.	4 Inches.
	Crushed with	Crushed with	Crushed with	Crushed with
	Tons.	Tons.	Tons.	Tons.
12–15	2.500	12.750	27.250	38.750
16–19	2.750	11.875	27.375	39.150
20–23	2.875	13.625	26.800	38.625
24–27	2.875	13.750	27.425	39.100
Total	11.000	52.000	108.850	155.625
Average	2.750	13.000	27.212	38.906
Do. per in.	2.750	3.250	3.024	2.431

Nos. 28 TO 36.—Four more pieces—each 2 × 2 × 2 inches—tried under the vertical pressure, took, on the average, 13.937 tons, or 3.484 tons to the square inch, to crush them. Two pieces, each 3 x 3—the one 11 inches, the other 16 inches in length—bore 27. tons and 25.5 tons. Two other pieces, each 4 × 4 inches—the one being 8 inches, the other 13 inches in length—bore respectively 47.75 tons and 38.-5 tons; and one piece— 12 × 12 × 15 inches in length—bore 481 tons, or 3.34 tons per square inch of base.

E = 771030. S = 2247.