scarph
An overlapping joint used to couple two timbers end-to-end without increasing their dimensions. Types include simple butt (flat) scarphs and more complicated hooked and keyed scarphs. (back)
schooner ...
scarf or scarph, or scarve - A method of joining pieces of wood by tapering their ends. A box scarph is when the ends are not tapered, but a half thickness cut out of each part so that when put together the parts form only one thickness.
Typically 6 inches thick for a 74-gun ship in the 19th century, the false keel was constructed in several pieces, which were scarphed together, and attached to the underside of the keel by iron staples.
5. Wooden boats can be built in any length, not restricted to multiples of 8x4ft /2.4×1.2m (less scarphs) as with a plywood boat.
Also applied to a wooden plug driven through a scarph joint between timbers to insure water tightness. STRAIN The measure of the alteration of form which a solid body undergoes when under the influence of a given stress.
 See also: Hull, Keel, Ship, Lines, Frame
  
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