from The Century Dictionary and Cyclopedia
- n. In mining, a piece of timber used in supporting the workings.
- n. In gunnery, a lug for the attachment of a gunlock, formed on the rear part of the barrel, near the vent, in guns of the older varieties.
Sorry, no etymologies found.
All the new guns are marked on the top of the lock-piece, base-ring, the reinforce sight-mass, and the swell of the muzzle, by notches which indicate a vertical plane passing through the axis of the bore, at right angles to the axis of the trunnions.
For other guns the position of the lock-piece is marked on the profile-board, and their measures taken as above.
Half the difference between the diameters of the gun at the base-ring and swell of the muzzle, or at any intermediate point on the line of metal, will give the proper height of the dispart-sight at the point where the least diameter was taken, to which must be added the height of the lock-piece above the base-ring, in order to get a line of sight over it, parallel to the axis of the bore.