Page:Timber and Timber Trees, Native and Foreign.djvu/197

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Table LXXXVIII.
Vertical or Crushing Experiments on cubes of—

Number of the specimen.	1 Inch.	2 Inches.	3 Inches.	4 Inches.
	Crushed with	Crushed with	Crushed with	Crushed with
	Tons.	Tons.	Tons.	Tons.
13–16	2.675	11.00	27.750	45.000
17–20	3.000	11.00	27.000	45.500
21–24	2.675	11.25	26.875	44.875
25–28	2.875	10.75	27.875	45.125
Total	11.225	44.00	109.500	180.500
Average	2.806	11.00	27.375	45.125
Do. per in.	2.806	2.75	3.042	2.820

Nos. 29 and 30.

Crushed with
the weight of

One piece,	9″.5 × 9″.5 × 15″,	307	tons	=	3.493	tons per square inch.
One piece,„	9″.5 × 9″.5 × 18″,	336.8	tons„	=	3.833	tons per„square inch.„

E= 492550.S = 2105.

THIE MEXICAN MAHOGANY TREE (Swietenia)

is the produce of Mexico, in Central America, where it is very abundant. It is of straight growth and outvies every other description of mahogany in its noble dimensions. It yields the timber of commerce in squares of 15 to 36 inches, by 18 to 30 feet in length. These are, however, only the ordinary lengths brought to market, the stems being generally cut into short pieces for the convenience of getting them down the hatchways of the ships, which have frequently to load in a roadstead, where it would be unsafe to open a raft-port.

Some of the trees from the district of Minatitlan must be very large, since it is no unusual thing to meet with well-squared pieces of this timber, measuring 40 to