Page:Timber and Timber Trees, Native and Foreign.djvu/186

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Officers have, however, hesitated to employ it for beams which are intended to carry heavy guns, lest it should contain some hidden defect of the character just mentioned. It is only sparingly used in works of civil architecture, on account of its great specific gravity.

Table LXXX.— Sabicu (Cuba).
Transverse Experiments.

Number of the specimen.	Deflections.			Total weight required to break each piece.	Specific gravity	Weight reduced to specific gravity 1000.	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.
1	1.00	.00	3.2.5	1,090	936	1165	272.50
2	1.00	.10	4.10	1,510	928	1735	377.50
3	1.00	.05	3.15	1,090	899	1213	272.50
4	.85	.00	4.25	1,390	910	1527	347.50
5	1.00	.05	3.50	1,280	923	1387	320.00
6	.90	.00	4.25	1,395	904	1543	348.75
Total	5.75	.20	22.50	7,755	5500	8570	1938.75
Average	.958	.033	3.75	1,292.5	916.66	1428.33	323.125

Remarks.—Nos. 1, 4, 5, and 6 broke with about 10 to 11 inches fracture; 2 and 3 broke with 8 inches fracture.

 

Table LXXXI.
Tensile Experiments.

Number of the specimen.	Dimensions of the pieces.			Specific gravity.	Weight the piece broke with.	Direct cohesion on 1 square inch.
	Inches.				lbs.	lbs.
7	$\scriptstyle {\left.{\begin{matrix}\ \\\\\ \\\ \\\ \\\ \\\ \\\ \ \end{matrix}}\right\}\,}$	2 × 2 × 30	$\scriptstyle {\left\{{\begin{matrix}\ \\\\\ \\\ \\\ \\\ \\\ \\\ \ \end{matrix}}\right.}$	923	17,360	4,340
8				904	24,360	6,090
9				910	22,120	5,530
10				936	21,280	5,320
11				899	20,776	5794
12				928	27,496	6,874
Total	...			5500	133,392	33,348
Average	...			916.66	22,232	5,558