302
TIMBER AND TIMBER TREES.
[CHAP.
| Number of the specimen. |
Deflections. | Total weight required to break each piece. |
Specfic gravity. | Weight required to sepcific gravity 600. |
Weight required to break 1 square inch. |
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. | Inch. | Inches. | lbs. | lbs. | lbs. | |||||
| 35 | c′ | 1.50 | .15 | 4.00 | 760 | 550 | 829 | 190.00 | — | — |
| 36 | b′ | 1.40 | .15 | 3.75 | 710 | 580 | 734 | 177.50 | — | — |
| 37 | a′ | 1.50 | .20 | 4.00 | 705 | 560 | 755 | 176.25 | — | — |
| 38 | a | 1.25 | .00 | 3.75 | 765 | 595 | 771 | 191.25 | 3325 | 47 |
| 39 | b | 1.25 | .15 | 3.00 | 640 | 580 | 662 | 160.00 | 3080 | 48 |
| 40 | c | 1.35 | .10 | 5.25 | 810 | 555 | 876 | 202.50 | 3920 | 49 |
| Total | 8.25 | .75 | 23.75 | 4390 | 3420 | 4627 | 1097.50 | — | — | |
| Aver. | 1.375 | .125 | 3.958 | 731.66 | 570 | 771 | 182.91 | — | — | |
Remarks.—These specimens broke with a moderate length of fracture.
E = 722360. S = 1922.
The mean of the whole being E = 698240. S = 1805.
Relatively considered, these experiments stand as follows:—
| TRANVERSE STRENGTH | TENSILE STRENGTH |
| Top-length | Top-length |
| a – a′ = .87 | a – a′ = 1.00 |
| b – b′ = .95 | b – b′ = .94 |
| c – c′ = 1.00 | c – c′ = .73 |
| Mid-length | Mid-length |
| a – a′ = 1.00 | a – a′ = 1.00 |
| b – b′ = .95 | b – b′ = .93 |
| c – c′ = .95 | c – c′ = .93 |
| Butt-length | Butt-length |
| a – a′ = .94 | a – a′ = .85 |
| b – b′ = .86 | b – b′ = .79 |
| c – c′ = 1.00 | c – c′ = 1.00 |
