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Antique English WALKERS MARK III slider.

Antique English WALKERS MARK III slide complete with rotor and flywheel. This device was

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Antique English WALKERS MARK III slide complete with rotor and flywheel. This device was used on ships to measure their speed and the miles traveled. It is a piece of the 40's, in perfect condition. It has 3 dials, in the one marked 0-9 it reports the speed, the big dial adds up the miles traveled and the other small one adds up the total miles traveled up to 1000. Dimensions. Rotor 37 cm, slider 11 cm sphere by 24 cm long, counterweight 15 cm long, rotor end 70 cm, flywheel diameter 27 cm.

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