Page:Timber and Timber Trees, Native and Foreign.djvu/299

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Table CXLVIII.—Yellow Pine (Canada).
Transverse Experiments.

Number of the specimen.	Deflections.			Total weight required to break each piece.	Specific gravity.	Weight reduced to specific gravity 600.	Weight required to break 1 square inch.
	With the apparatus weighing 390 lbs.	After the weight was removed.	At the crisis of breaking.
	Inches.	Inches.	Inches.	lbs.			lbs.
1	2.000	1.750	4.50	630.0	424	891	157.50
2	2.000	1.650	5.00	636.0	432	882	159.00
3	2.000	1.850	4.50	684.0	464	884	171.00
4	1.750	1.650	4.50	660.0	444	892	165.00
5	2.250	2.000	3.75	552.0	435	761	138.00
6	2.750	2.100	5.75	598.0	411	873	149.50
Total	12.75	11.00	28.00	3760	2610	5183	940.00
Average	2.125	1.833	4.66	626.6	435	864	156.66

Remarks.—The whole of these broke with a moderate length of fracture and splintery.

The above-mentioned specimens were all of good quality, well seasoned, and taken from trees of 6 to 8 feet in circumference. It will be observed that the specific gravity and breaking strains varied only in a slight degree. By the formulæ—

E = 309240.S = 1645.

Experiments were also made to test the transverse strength of a series of seven pieces (Table CXLIX.) cut from a plank 2 inches thick, taken out of the middle or centre part of the butt-end of a tree, the centre piece ʘ being made to include the pith (Fig. 30).
FIG. 30.