any of various devices for determining the speed of a ship by means of a vaned rotor streamed at the end of a log line upon which it exerts a torsion transmitted to a registering device on board.
(nautical) any of several mechanical devices for measuring the speed of a vessel and the distance travelled, consisting typically of a trailing rotor that registers its rotations on a meter Compare chip log
noun, Nautical. 1. mooring screw. mooring screw noun, Nautical. 1. a broad, augerlike anchor used for securing buoys in soft-bottomed lakes, rivers, etc.
noun 1. drive screw.
noun 1. a nut threaded to receive a screw.