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the floor timbers to the keel; in iron vessels, a structure of plates, situated like the keelson of a timber ship. Cross keelson, a similar structure lying athwart the main keelson, to support the engines and boilers.

The keel and keelson of a ship.

The transoms, knees, beams, keelson, and other chief timbers used for connecting and strengthening the parts of a vessel.

That part of the bottom of a vessel on each side of the keelson which is most nearly horizontal.

-- Ground timbers (Shipbuilding) the timbers which lie on the keel and are bolted to the keelson; floor timbers. Knight. -- Ground tit. (Zoöl.) See Ground wren (below). -- Ground wheel, that wheel of a harvester, mowing machine, etc., which, rolling on the ground, drives the mechanism. -- Ground wren (Zoöl.), a sma…

, a combination of plates supplies the place of the keel of a wooden ship. See Illust. of Keelson.

See Keelson. Sir W. Raleigh.

Gutters or conduits on each side of the keelson to afford a passage for water to the pump well. Limber boards (Naut.), short pieces of plank forming part of the lining of a ship's floor immediately above the timbers, so as to prevent the limbers from becoming clogged. -- Limber box or chest (Mil.), a box on the limber…

An interior rib occasionally fixed in a ship's hold, reaching from the keelson to the beame of the lower deck, to strengthen her frame. Totten.

of extraordinary physical strength. Samson post. (a) (Naut.) A strong post resting on the keelson, and supporting a beam of the keelson, and supporting a beam of the deck; also, a temporary or movable pilar carrying a leading block or pulley for various purposes. Brande & C. (b) In deepwell boring, the post which suppo…

A piece of curved timber bolted to the stem, keelson, and apron in a ship's frame near the bow.

ended to receive an upright shaft; specif., a block of wood, or a solid platform upon the keelson, supporting the heel of the mast.

The end of a ship's keelson, to which the sternpost is bolted; -- called also stern knee.