cutting-down line

The Sailor's Word-Book

An elliptical curve line used by shipwrights in the delineation of ships; it determines the depth of all the floor timbers, and likewise the height of the dead-wood fore and aft. It is limited in the middle of the ship by the thickness of the floor timbers, and abaft by the breadth of the keelson, and must be carried up so high upon the stern as to leave sufficient substance for the breeches of the rising timbers.

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