considered one of the best woods for working that the carpenter can take in hand.
There are many experiments on the strength of the Kauri Pine, and the first to be noticed are on specimens
FIG. 33.
taken from the butt-end of a log that was fully 60 feet in length and 22 inches square. A plank 2 inches thick having been taken out of the middle, it was cut to produce six pieces of 2 × 2 × 84 inches, four upon one side of the centre or pith and two upon the other (Fig. 33). The centre piece was excluded from the test as being of too weak a nature to bear comparison with the rest of the wood.
| 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 | d | 1.25 | .00 | 3.75 | 818 | 525 | 934 | 131.25 |
| 2 | c | 1.25 | .15 | 4.25 | 875 | 529 | 992 | 132.25 |
| 3 | b | 1.15 | .10 | 4.20 | 820 | 529 | 930 | 132.25 |
| 4 | a | 1.05 | .00 | 3.75 | 750 | 520 | 865 | 130.00 |
| 5 | a′ | 1.15 | .10 | 3.40 | 760 | 515 | 885 | 128.75 |
| 6 | b′ | 1.50 | .15 | 4.15 | 870 | 562 | 929 | 140.50 |
| Total | 7.350 | .500 | 23.500 | 4893.0 | 3180 | 5535 | 795.00 | |
| Average | 1.225 | .083 | 3.916 | 815.5 | 530 | 917 | 132.50 | |
Remarks.—These specimens broke with a moderate length of fracture.
E = 790810. S = 2141.
The table shows that transversely the strongest point was much nearer to the more recently-formed con-
