Lock Nut

In artillery carriages, elevating gears, etc., a nut placed in contact with the main nut, on the same shaft to keep the main nut from turning. Lock-piece. A block of of metal at the As outer opening of are the vent for the —attachment, the lock. friction-tubes now used for firing cannon in the land service, this part is omitted Lock Plate. — The plate in a small-arm which covers the lock, and to which the mechanism is attached.