Page:Timber and Timber Trees, Native and Foreign.djvu/276

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256
TIMBER AND TIMBER TREES.
[CHAP.

Table CXXXV.—Spruce (Canada).
Transverse Experiments.
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.
With the
apparatus
weighing
390 lbs.
After the
weight
was
removed.
At
the crisis
of
breaking.
  Inches. Inch. Inches. lbs.     lbs.
1 1.250 .060 6.250 696 451 926 112.75
2 1.200 .050 5.000 719 485 890 121.25
3 1.150 .040 3.750 556 510 654 127.50
4 1.300 .070 5.750 709 490 867 122.50
Total . 4900 .220 20.750 2680 1936 3337 484.00
Average 1.225 .055 5.187 670 484 834 121.00

Remarks.— No. 1 broke with about 12 inches length of fracture ; 2, 3, and 4 with only a little less.

Table CXXXVI.
Tensile Experiments.
(Dimensions of each piece, 2 × 2 × 3 inches, s.g. 484.)
—— No. 5. No. 6. No. 7. No. 8. Total. Average.
  lbs. lbs. lbs. lbs. lbs. lbs.
Weight the piece
broke with
13,104 19,040 13,440 17,360 62,944 15,736
Direct cohesion on
1 square inch
3,276 4,760 3,360 4,340 15,736 3,934
Table CXXXVII.
Vertical or Crushing Strain on cubes of 2 inches.
No. 9. No. 10 No. 11. No. 12 No. 13. No. 14. Total. Average. Ditto on 1 sqaure inch.
Tons. Tons. Tons. Tons. Tons. Tons. Tons. Tons.
9.00 8.875 7.75 8.875 8.75 8.75 52.00 8.666 2.166

E = 771800.S = 1759.