chip log

chip log

noun Nautical.
a log for measuring the speed of a vessel.
Also called hand log.


Origin:
1825–35

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World English Dictionary
chip log
 
n
nautical a log for determining a vessel's speed, consisting of a wooden chip tossed overboard at the end of a line that is marked off in lengths of 47 feet 3 inches; the speed is calculated by counting the number of such intervals that pass overboard in a 28-second interval

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