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of an oscillating steam cylinder, to support it. It is usually tubular, to convey steam. Trunnion plate (Gun.), a plate in the carriage of a gun, mortar, or howitzer, which covers the upper part of the cheek, and forms a bearing under the trunnion. -- Trunnion ring (Gun.), a ring on a cannon next before the trunnions…

Provided with trunnions; as, the trunnioned cylinder of an oscillating steam engine.

A metal covering plate which passes over the trunnions of a cannon, and holds it in place.

smashing in, rather than piercing, the object aimed at, as the side of a ship. It has no trunnions, but is supported on its carriage by a bolt passing through a loop on its under side.

The part of a cannon from the reënforce or the trunnions to the swell of the muzzle. See Cannon.

A piece of metal placed on the muzzle, or near the trunnions, on the top of a piece of ordnance, to make the line of sight parallel to the axis of the bore; -- called also dispart sight, and muzzle sight.

The bolt of the cap-square over the trunnion of a cannon. Knight.

In old ordnance, one of the handles above the trunnions by which the gun was lifted.

A band on a trip-hammer helve, bearing the trunnions.

bed (Mil.), a framework of wood and iron, suitably hollowed out to receive the breech and trunnions of a mortar. -- Mortar boat or vessel (Naut.), a boat strongly built and adapted to carrying a mortar or mortars for bombarding; a bomb ketch. -- Mortar piece, a mortar. [Obs.] Shak.

tes; vibrating; swinging. Oscillating engine, a steam engine whose cylinder oscillates on trunnions instead of being permanently fixed in a perpendicular or other direction. Weale.

The excess of weight of that part of a canon behind the trunnions over that in front of them.

Having trunnions the axes of which lie below the bore; -- said of a cannon.

A short cylinder connecting a trunnion with the body of a cannon. See Illust. of Cannon.

A small piece of metal, fixed or movable, on the breech, muzzle, center, or trunnion of a gun, or on the breech and the muzzle of a rifle, pistol, etc., by means of which the eye is guided in aiming. Farrow.

The part of a mortar extending from the chamber to the trunnions.

A cask suspended on trunnions, in which fermentation is carried on. Hypostatic union (Theol.) See under Hypostatic. -- Latin union. See under Latin. -- Legislative Union (Eng. Hist.), the union of Great Britain and Ireland, which took place Jan. 1, 1801. -- Union, or Act of Union (Eng. Hist.), the act by which Scotl…