Tread. The length of vessel's keel.
Treble Block. Block having three sheaves on the same pin.
Tree. Wooden beam, or bar, used in the furniture of a ship. Usually qualified by a word giving its particular function or description; e.g. crosstree, rough tree, chess tree, trestle tree,
waist tree, etc.
Treenail. Cylindrical length of wood, from one to two inches in diameter, used for securing planking to frames, and other purposes, in wood-built vessels.
Trekschuyt. Covered boat formerly used in Holland and Flanders for transporting goods and passengers. Was towed by horses or oxen.
Trend. The increase in girth of an Admiralty pattern anchor shank as it approaches the arms. Extends for a distance equal to that of arms. 2. Angle between a vessel's fore and aft line and the cable to which she is riding.
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