Page:Growing Black Locust Trees.djvu/29

5-inch posts, and one a 6-inch post. By way of comparison, a tree of the same diameter (8 inches) but 60 feet in height can be cut into nine posts, of which five will be 4-inch, three 5-inch, and one a 6-inch post in top diameter. The posts will be round or split and of equivalent bulk.

Table 1.—Number of 7-foot fence posts that can be cut from black locust trees of different heights and diameters and of average straightness and soundness ^[1]

Diameter of tree outside bark at height of 4½ feet (inches)	Total height of tree		Posts (round or equivalent split posts) from average-shaped tree
			4-inch [2]	5-inch [2]	6-inch [2]	Total per tree
	Feet		Number	Number	Number	Number [3]
6	$\scriptstyle {\left\{{\begin{matrix}\ \\\\\ \\\ \ \end{matrix}}\right.}$	30	1			1
		40	1			1
		50	2			2
		60	2			2
7	$\scriptstyle {\left\{{\begin{matrix}\ \\\\\ \\\ \\\ \ \end{matrix}}\right.}$	30	2	1		3
		40	2	1		3
		50	3	1		4
		60	3	2		5
		70	4	2		6
8	$\scriptstyle {\left\{{\begin{matrix}\ \\\\\ \\\ \\\ \ \end{matrix}}\right.}$	30	3	1		4
		40	4	2	1	7
		50	4	2	1	7
		60	5	3	1	9
		70	6	4	1	11
9	$\scriptstyle {\left\{{\begin{matrix}\ \\\\\ \\\ \\\ \ \end{matrix}}\right.}$	40	5	3	1	9
		50	6	3	2	11
		60	8	4	2	14
		70	10	5	3	18
		80	11	6	3	20
10	$\scriptstyle {\left\{{\begin{matrix}\ \\\\\ \\\ \\\ \ \end{matrix}}\right.}$	40	6	4	2	12
		50	8	5	2	15
		60	11	6	3	20
		70	13	7	4	24
		80	16	9	5	30
11	$\scriptstyle {\left\{{\begin{matrix}\ \\\\\ \\\ \\\ \\\ \ \end{matrix}}\right.}$	40	7	5	2	14
		50	10	6	3	19
		60	13	7	4	24
		70	17	9	5	31
		80	20	11	6	37
		90	23	13	7	43
12	$\scriptstyle {\left\{{\begin{matrix}\ \\\\\ \\\ \\\ \\\ \ \end{matrix}}\right.}$	40	9	6	3	18
		50	12	7	4	23
		60	16	9	5	30
		70	20	11	6	37
		80	24	14	7	45
		90	28	16	9	53
13	$\scriptstyle {\left\{{\begin{matrix}\ \\\\\ \\\ \ \end{matrix}}\right.}$	60	20	12	7	39
		70	24	14	8	46
		80	28	17	9	54
		90	32	20	11	63
14	$\scriptstyle {\left\{{\begin{matrix}\ \\\\\ \\\ \ \end{matrix}}\right.}$	60	23	14	8	45
		70	28	17	10	55
		80	33	20	12	65
		90	38	24	13	75
15	$\scriptstyle {\left\{{\begin{matrix}\ \\\\\ \ \end{matrix}}\right.}$	60	26	16	10	52
		70	32	20	12	64
		80	39	25	14	78
16	$\scriptstyle {\left\{{\begin{matrix}\ \\\\\ \ \end{matrix}}\right.}$	60	30	19	11	60
		70	37	23	14	74
		80	45	28	17	90
17	$\scriptstyle {\left\{{\begin{matrix}\ \\\\\ \ \end{matrix}}\right.}$	60	33	22	13	68
		70	42	26	17	85
		80	52	32	20	104
18	$\scriptstyle {\left\{{\begin{matrix}\ \\\\\ \ \end{matrix}}\right.}$	60	38	25	15	78
		70	48	30	19	97
		80	58	36	23	117
19	$\scriptstyle {\left\{{\begin{matrix}\ \\\ \end{matrix}}\right.}$	70	54	33	22	109
		80	66	40	26	132
20	$\scriptstyle {\left\{{\begin{matrix}\ \\\ \end{matrix}}\right.}$	70	60	37	25	122
		80	73	44	29	146

1. Computed by the Central States Forest Experiment Station (U. S. Forest Service). The values are calculated and have not been checked by actual cutting operations.
2. Measured inside bark.
3. The sums of the 3 previous columns.