keelson

A timber or girder fastened above and parallel to the keel of a ship or boat for additional strength.

A line of jointed timbers in a ship laid on the middle of the floor-timbers over the keel, fastened with long bolts and clinched, thus binding the floor-timbers to the keel; in iron ships, a combination of plates corresponding to the keelson-timber of a wooden vessel. See cut under keel.

In iron ship-building, a longitudinal reinforcement of plates and bars in the interior of the vessel above the framing in the bottom.

A piece of timber in a ship laid on the middle of the floor timbers over the keel, and binding the floor timbers to the keel; in iron vessels, a structure of plates, situated like the keelson of a timber ship.

a similar structure lying athwart the main keelson, to support the engines and boilers.

A longitudinal beam fastened on top of the keel of a vessel for strength and stiffness.

a longitudinal beam connected to the keel of ship to strengthen it