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Photographer's Note

Another old fashioned device used on the Tecla in addition to the modern navigation instruments, is the patent-log (also called screw log, or taffrail log, see below), a mecanical device measuring the distance/peed over water. This log is made of a counter (visible here on the rail), a hard cable (visible behind the wheel shaped metal piece), and a torpedo shaped apparatus immerged in the water. The apparatus has fins, and rotates with the speed, wich is registred by the mecanical counter. We used to measure the distance every hour during our watches when the log book was updated.
Another one in workshop, where the cable is more visible.

PS Elements 6.0

A very nice week end to all, and the defintion of "patent-log" found on a dictionnary site on the net:
patent log
n. Nautical
A torpedo-shaped instrument with rotary fins that is dragged from the stern of a vessel to measure the speed or distance traveled. Also called screw log, taffrail log.

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Additional Photos by Emmanuel LE CLERCQ (emjleclercq) Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 2013 W: 62 N: 3116] (15778)
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