Definitions for taffrail log
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Princeton's WordNet
patent log, screw log, taffrail log(noun)
a cigar-shaped log with rotary fins that measure the ship's speed
Wiktionary
taffrail log(Noun)
A mechanical device dragged from the stern of the vessel that indicates the vessel's speed through the water; usually consists of a propeller, a reading unit and a stiff line connecting them.
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"taffrail log." Definitions.net. STANDS4 LLC, 2013. Web. 18 May 2013. <http://www.definitions.net/definition/taffrail log>.