, or kelson.
An internal keel, laid upon the middle of the floor-timbers, immediately over the keel, and serving to bind all together by means of long bolts driven from without, and clinched on the upper side of the keelson. The main keelson, in order to fit with more security upon the floor-timbers, is notched opposite to each of them, and there secured by spike-nails. The pieces of which it is formed are usually less in breadth and thickness than those of the keel.