Specimens 19 to 24, with the early layers, also 25 to 30, with the later layers of wood, were taken from a log of the same dimensions as the last, and under precisely the same conditions as those referred to in Tables CLIV. and CLV., the results being nearly as before; that is, specimen 20, or the second piece from the butt-end of the early growth, and specimen 25, or the butt length of the later growth, are the two strongest pieces of the respective series. We also see in the mean results of the experiments that the strength of the inner is to the outer wood as 733 1755. Thus the outside is as before, the strongest.
The mean of Tables CLIII. and CLVL, with early layers or inner wood,
E= 711945. S=2130.
The mean of Tables CLV. and CLVII., with later layers or outer wood,
E=763800.S=2264.
Number of the specimen. |
Dimensions of each piece. |
Specific gravity. |
Weight the pieces broke with. |
Direct cohesion on 1 square inch. | ||
Inches. | lbs. | lbs. | ||||
31 | 2 × 2 × 30 | 693 | 16,800 | 4,200 | ||
32 | 630 | 17,640 | 4,410 | |||
33 | 651 | 19,320 | 4,830 | |||
34 | 620 | 17,920 | 4,480 | |||
35 | 662 | 19,600 | 4,900 | |||
36 | 698 | 20,720 | 5,180 | |||
Total. | ... | 3954 | 112,000 | 28,000 | ||
Average | ... | 659 | 18,666 | 4,666 |
No. 37. | No. 38. | No. 39. | No. 40. | No. 41. | No. 42. | Total. | Average. | Ditto on 1 square inch. |
Tons. | Tons. | Tons. | Tons. | Tons. | Tons. | Tons. | Tons. | |
10.875 | 111.25 | 11.5 | 11.625 | 12.00 | 12.125 | 69.25 | 11.542 | 2.885 |