Log
Log, in nautical measurement, device used to measure a ship's speed. It consists of a piece of board in the form of a quadrant of a circle, balanced so as to float upright. When thrown from the ship, it drags on the line to which it is attached, causing it to unwind at a rate corresponding to the ship's velocity.
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21st Century Webster's Family Encyclopedia21st Century Webster's Family Encyclopedia - Liliuokalani, Lydia Kamekeha to Lyon