from The Century Dictionary and Cyclopedia
- n. A device for determining the strength of gunpowder.
- n. A small cannon or musket suspended horizontally in a swinging frame furnished with a fixed arc, properly graduated, and a movable pointer, for ascertaining the angular distance through which the gun oscillates in its recoil.
Sorry, no etymologies found.
The cannon-powder for proof shall be of not less than 1,500 feet initial velocity, as determined by the gun-pendulum at the Ordnance
Velocities, determinable by the gun-pendulum of the Ordnance Yard at