HyperDic: taffrail_log

English > 1 sense of the expression taffrail log:
NOUNartifacttaffrail log, patent log, screw loga cigar-shaped log with rotary fins that measure the ship's speed
English > taffrail log: 1 sense > noun 1, artifact
MeaningA cigar-shaped log with rotary fins that measure the ship's speed.
Synonymspatent log, screw 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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