from The Century Dictionary and Cyclopedia
- n. A piece of leather placed over the vent of a cannon to keep the box dry.
Sorry, no etymologies found.
_Take implements_ the gunner stepped to the cascabel and handed the vent-cover to No. 2; the tube-pouch he gave to No. 3; he put on his fingerstall, leveled the gun with the elevating screw, applied his level to base ring and muzzle to find the highest points of the barrel, and marked these points with chalk for a line of sight.
Under the wheels are two chocks; the vent-cover is on the vent,