Two doors, right and left of trail, on inner side, give access to the cartridge-space in the body, and a door on top of the upper end of trail to the cartridge-space in the trail, the two parts being continuous. Lower down in the trail is a tool-box to which the trail-seat, when raised, gives access. The top of the carriage makes a convenient table for tools, feed-guides, and ammunition when in action.
The shield with aperture and disks are so combined that the gun can be readily pointed without exposure.
CHAPTER X.
Theoretical Gunnery. Definitions. General Principles. Probability of Fire. Burst of Shell. Burst of Shrapnel.
DEFINITIONS.
INTERIOR BALLISTICS.
Interior Ballistics.—The effects produced on a projectile in the bore of a gun, and on the gun, when subjected to the action of the products of combustion of gunpowder or other explosives.
Gunpowder Explosion is the rapid conversion of gunpowder into gases and solids with evolution of heat.