| Against cannon.— | 4 feet, when of wood, or brick. | |||
| 6 | feet against | 6-pounders, | when of earth. | |
| 9 | ” | 9-pounders, | ditto. | |
| 14 | ” | 12-pounders, | ditto. | |
| 18 | ” | 18 & 24-pounders, ditto. | ||
Note.—A 6-pounder shot, with a charge of one pound, will penetrate a mass of ice to the depth of 4½ feet, at the distance of twenty-one yards.
GENERAL DIMENSIONS OF AN ELEVATED GUN BATTERY,
| reveted with fascines. | ||
| ft. | in. | |
| Space from the centre of one embrazure to that of the next, without traverses | 18 | 0 |
| Ditto, with traverses | 22 | 0 |
| Slope of the interior revetment, per foot (one-fourth its height) | — | 3 |
| Fall of the superior slope, ditto (one-twelfth, ditto) | — | 1 |
| Interior width of embrazures, measured on the sill | 2 | 0 |
| Exterior ditto, measured on the sole, at 12 feet from the sill | 7 | 0 |
| Slope of the cheeks of embrazures at the neck, per foot, (one-sixth of their height) | — | 2 |
| Ditto, at the mouth, per foot (one-fourth their height) | — | 3 |
| Distance from the centre of an embrazure to the foot of the slope of an adjoining traverse | 7 | 6 |
| Distance from the centre of an embrazure to the foot of the slope of an adjoining epaulment | 5 | 0 |
| Height of the sill about | 3 | 0 |
DIRECTIONS FOR TRACING A BATTERY.
Batteries at sieges are generally traced in the dusk of the evening.
Detail of men, and tools required:
Tracers.—1 non-commissioned officer, and 2 privates.
Tools.—1 ground-square. 1 measuring tape.
1 white tracing-line. 2 ten-feet rods. 1 bundle of pickets. 1 mallet.