Walker’s cherub mark II ship log

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Walker's patent "Cherub" mark II, ship's log. The log was used to record a ship's speed. This device would have a line and 'fish' or spinner attached to the rear. The spinner was then cast into the sea, and as it turned in the ship's wake, the revolutions were counted by the mechanical log to record the distance travelled and the speed. Sometimes called a taffrail log, the Mark II was manufactured from about 1900 until 1930.

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