| Weight of | ||||||
|---|---|---|---|---|---|---|
| Powder | Cartridges, complete | |||||
| oz. | dr. | gr. | oz. | dr. | gr. | |
| English. | 0 | 6 | 0 | 1 | 9 | 11 |
| Hessian. | 0 | 7 | 10 | 1 | 7 | 2 |
| Austrian. | 0 | 6 | 13 | 1 | 6 | 4 |
| Dutch. | 0 | 10 | 10½ | 1 | 12 | 4 |
| French. | 0 | 7 | 4½ | 1 | 6 | 0 |
CASE SHOT. See [Shot].
CHAMBERS.—In 1787 and 1789 experiments were made at Woolwich with an 8 inch mortar, with four shifting chambers, to ascertain which form gives the longest range.
The chambers were all of the same capacity, viz. 63.7 cubic inches, and contained two pounds of powder. Their forms were:
1st. Common conical chamber with the circular bottom.
2d. The same reversed.
3d. The cylindric chamber with circular bottom.
4th. The spheric chamber.
The ranges were the medium of 6 rounds; from them it appears, that when the spheric chamber is filled with powder, it has the advantage in point of range; but when smaller charges are used, its ranges are found to be shorter than those of other forms. The conical (No. 1.) chamber of the present establishment gives the longest range under other circumstances.
CHARGES.