Last Updated:2025/12/04
(nautical, historical) Any early device for measuring the speed of a moving ship, where a sailor threw a floating object overboard and used a sandglass to measure the time it took to pass between two points on deck.
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Dutchman's log
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Source Word
Dutchman's log
Noun
historical
Japanese Meaning
船の航速を測定する初期の装置。具体的には、船員が船外に浮体を投げ、砂時計でその浮体が甲板上の2点の間を通過する時間を計り、船の速度を推定する装置。