Dutchman's log

英語（米国） (en-US) 英語（イギリス） (en-GB)

名詞

歴史的

(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.

日本語の意味

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。

英語の意味

(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.

このボタンはなに？

On the calm morning, the old seafarer demonstrated how to use the Dutchman's log, tossing a chip overboard and timing its passage with a sandglass.

穏やかな朝、年老いた船乗りは初期の船速測定装置の使い方を披露し、小さな浮き片を海に投げ、砂時計で甲板の二点間を通過する時間を計った。

詳細

意味（1）

(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.