Page:Timber and Timber Trees, Native and Foreign.djvu/192

172 {| Tensile Experiments. of the specimen. each piece. gravity. piece broke with. cohesion on 1 square in.
 * Number
 * Number
 * colspan=3|Dimensions of
 * Specific
 * Weight the
 * Direct
 * colspan=3|Inches.
 * lbs.
 * lbs.
 * 7
 * rowspan=5|
 * rowspan=5|2 × 2 × 30
 * rowspan=5|
 * 752
 * 19,040
 * 4,760
 * 8
 * 765
 * 19,824
 * 4.956
 * 9
 * 817
 * 15,120
 * 3,780
 * 10
 * 720
 * 11,200
 * 2,800
 * 11
 * 771
 * 10,640
 * 2,660
 * Total
 * colspan=3|...
 * 3825
 * 75,824
 * 18,956
 * Average.
 * colspan=3|...
 * 765
 * 15,165
 * 3,791
 * }
 * 3825
 * 75,824
 * 18,956
 * Average.
 * colspan=3|...
 * 765
 * 15,165
 * 3,791
 * }
 * }

28 TO 36.—Four more pieces—each 2 × 2 × 2 inches—tried under the vertical pressure, took, on the average, 13.937 tons, or 3.484 tons to the square inch, to crush them. Two pieces, each 3 x 3—the one 11 inches, the other 16 inches in length—bore 27. tons and 25.5 tons. Two other pieces, each 4 × 4 inches—the one being 8 inches, the other 13 inches in length—bore respectively 47.75 tons and 38.-5 tons; and one piece— 12 × 12 × 15 inches in length—bore 481 tons, or 3.34 tons per square inch of base.