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Bore (Metallurgy a tool bored to fit)

in metallurgy, a tool bored to fit the shank of a forged nail, and adapted to hold it while the head is brought to shape by the hammer. The depression in the face of the bore is adapted to the shape required of the chamfered under part of the head. The word is also applied to the cavity of a steam engine cylinder, pump barrel, pipe, cannon, barrel of a firearm, etc. In mechanics it is expressed in inches of diameter; in cannon formerly in the weight in pounds of solid round shot adapted thereto, but since the introduction of modern rifled ordnance of the breechloading pattern, the bore of cannon is always expressed in inches of diameter or in the equivalent of inches.