patent log, screw log, taffrail log(noun)
a cigar-shaped log with rotary fins that measure the ship's speed
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.
The numerical value of taffrail log in Chaldean Numerology is: 5
The numerical value of taffrail log in Pythagorean Numerology is: 8
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"taffrail log." Definitions.net. STANDS4 LLC, 2018. Web. 21 Apr. 2018. <https://www.definitions.net/definition/taffrail log>.