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Why the book where the record of a ship's speed, its progress, and any shipboard events of navigational importance is called Log?

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The name is derived from the chip log, a device used to measure a ship speed. The book was used mainly to keep a record of the ship speed, so it was called the logbook, then reduced to just log.

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Would it normally be capitalised, as in the question, or not, as in your answer? – Leon Conrad Mar 27 '14 at 11:56
Normally not capitalised. – curiousdannii Mar 27 '14 at 12:17

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