Number of the specimen. |
Deflections. | Total weight required to break each piece. |
Specific gravity. |
Weight required to break 1 square inch. | |||
With the apparatus weighing 390 lbs. |
At the crisis of breaking. | ||||||
Inches. | Inches. | lbs. | lbs. | Kept dry in the store-room. | |||
1 | 2.00 | 375 | 700 | 643 | 175.00 | ||
2 | 2.50 | 5.00 | 770 | 650 | 192.50 | ||
Total | 4.50 | 8.75 | 1470 | 1293 | 367.50 | ||
Average | 2.25 | 4.375 | 735 | 646.5 | 183.75 | ||
4 | 2.75 | 4.15 | 485 | 1064 | 121.25 | Kept in a box of manure. | |
5 | 3.50 | 4.50 | 420 | 1085 | 105.00 | ||
6 | 3.50 | 4.35 | 440 | 1090 | 110.00 | ||
Total . | 9.75 | 13.00 | 1345 | 3239 | 336.25 | ||
Average | 3.25 | 4.33 | 448.33 | 1079.66 | 112.08 |
Remarks.—No. 1 broke with scarph-like fracture, 7 inches in length; 2 broke in three pieces, each scarph-like, 7 inches in length; 4 broke with scarph-like fracture, 14 inches in length; 5 broke rather short, with small splinters; 6 broke with scarph-like fracture, 8 inches in length.
All the specimens that were kept dry, whether carbonised or not, were apparently in good condition; but those which had been placed in manure or damp earth, were more or less in a state of decomposition, the softer parts of the concentric layers being slightly wasted away with rot on the surface. The difference in strength between the carbonised and non-carbonised pieces was not very great, but the tables show that of the pieces kept dry, the loss of strength was greatest by about 8 per cent, in the carbonised specimens; and of those kept in manure, the loss was about per cent, in excess on the non-carbonised pieces. When the experiment for testing the strength was completed,