HyperDic: patent_log

English > 1 sense of the expression patent log:
NOUNartifactpatent log, screw log, taffrail loga cigar-shaped log with rotary fins that measure the ship's speed
English > patent log: 1 sense > noun 1, artifact
MeaningA cigar-shaped log with rotary fins that measure the ship's speed.
Synonymsscrew log, taffrail log
Broaderlogmeasuring instrument that consists of a float that trails from a ship by a knotted line in order to measure the ship's speed through the water

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