Page:Timber and Timber Trees, Native and Foreign.djvu/300

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We are thus enabled to compare the strength of the earlier and the later growth of this wood.

Table CXLIX.—Yellow Pine (Canada).
Transverse Experiments.—2nd Example.

Number of the the specimen.		Deflections.			Total weight required to break each piece	Specific gravity.	Weight required to specific gravity 600.	Weight required to break 1 square in.	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.
7.	3'	1.500	.500	4.250	508.00	568	537	127.00	2660	3.	22
8.	2'	1.250	.500	4.250	562.00	600	562	140.50	2800	2.	23
9.	1'	1.500	.500	2.250	480.00	537	536	120.00	2485	1.	24
10.	ʘ	2.250	1.100	2.750	360.00	430	502	90.00		ʘ
11.	1′	1.850	.850	3.000	480.00	588	490	120.00	2730	1′	25
12.	2′	1.900	.900	4.250	512.00	568	541	128.00	2800	2′.	26
13.	3′	1.750	.650	3.000	478.00	566	507	119.50	3080	3.	27
Total		12.000	5.000	23.750	3,380.00	3857	3675	845.00	16,555	—
Aver.		1.714	.714	3.393	482.85	551	525	120.71	2759	—

The mean results of the experiments are as follows, viz. :—

The centre piece	ʘ	s.g.	430	broke with	360	lbs.	E = 785170. S = 945
The„ next pieces	1 and 1	s.g.„	562	broke with„	480	lbs„	E = 902950. S = 1261
The„ next pieces	2 and„ 2′	s.g.„	584	broke with„	537	lbs„	E = 577020. S = 1425
The„ outer pieces„	3 and„ 3′	s.g.„	567	broke with„	493	lbs„	E = 822740. S = 1294

The mean of the 7 pieces being E = 902950 and S = 1267.

In the above example, there is something like a