Page:Timber and Timber Trees, Native and Foreign.djvu/302

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Table CL.—Yellow Pine (Canada).
Transverse Experiments.—3rd Example.

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.	Tensile Experiments.
		With the apparatus weighing 390 lbs.	After the weight was removed.	At the crisis of breaking.					Direct cohesion on 1 square in.	Number of the specimen.
		Inches.	Inches.	Inches.	lbs.			lbs.	lbs.
14.	4	2.000	.650	3.00	504.0	562	538.00	126.000	2485.00	4.	28
15.	3	1.750	.650	3.50	556.0	564	591.00	139.000	2800.00	3.	29
16.	2	1.500	.500	4.75	665.0	530	753.00	166.250	2870.00	2.	30
17.	1	2.250	.850	4.50	498.0	560	533.00	124.500	2240.00	1.	31
18.	1′	2.250	.750	3.25	513.0	526	585.00	128.250	1610.00	1′.	32
19.	2′	2.250	.850	2.75	419.0	566	444.00	104.750	2150.00	2′.	33
20.	3′	2.500	.750	2.85	421.0	544	464.00	105.250	2100.00	3′.	34
21.	4′	2.250	.650	3.00	460.0	564	490.00	115.000	1820.00	4′.	35
Total		16.750	5.650	27.60	4036.0	4416	4398.00	1009.000	18075.00	—
Aver.		2.093	.706	3.45	504.5	552	549.75	126.125	2259.37	—

E = 650960.S = 1324.

FIG. 31. These experiments are similar to the last, but the specimens were taken from a larger tree, and the soft wood about the pith, including the heart-shake, was allowed to drop out. In this case the woody layers were placed vertically in the machine for testing them transversely (Fig. 31). The mean results of the transverse experiments are as follows, viz.:—

The pieces	1 and 1′,	s.g.	543,	broke with	505	lbs.	E=622720.	S = 1327
The pieces„	2 and„ 2′,	s.g.„	548,	broke with„	542	lbs.„	E=752450.	S=1423
The pieces„	3 and„ 3′,	s.g.„	559,	broke with„	488	lbs.„	E=976160.	S=1282
The pieces„	4 and„ 4′	s.g.„	563,	broke with„	482	lbs.„	E=612170.	S=1265