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n. A pin or gudgeon, especially either of two small cylindrical projections on a cannon forming an axis on which it pivots.

n. One of the short stubby bearings on either side of a cannon; a gudgeon.

n. A similar rotational bearing comprising a rotating arc or ring sliding in the groove of a stationary arc, used in machinery to allow a workpiece to be moved relative to a fixed tool.

n. A cylindrical projection on each side of a piece, whether gun, mortar, or howitzer, serving to support it on the cheeks of the carriage. See Illust. of cannon.

n. A gudgeon on each side of an oscillating steam cylinder, to support it. It is usually tubular, to convey steam.

n. One of the cylindrical projections on the sides of a cannon, cast or forged in one piece with the cannon itself, which support it on its carriage.

n. In steam-engines, a hollow gudgeon on each side of an oscillating cylinder, which supports the cylinder, and through which steam is received and exhausted.

"The guns 'teams of oxen and horses were being led back into the shelter of the oaks while squads of gunners hoisted the hugely heavy cannon barrels out of their rear travelling trunnion holes and moved them into the forward fighting holes where other men used hammers to fasten the capsquares over the newly placed trunnions."

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