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Mechanism for accurate measurement of sea distance. It consisted of a box with co-operating gearwheels and an endless screw connected to a hydrokinetic winged wheel. The periphery of the wheel inside the wings touched sea level. The box was placed either on a float drawn by the ship or on the ship's internal sidewall with the wheel shaft penetrating the inner sidewall. The wheel rotated according to the speed of the ship. A calibrated disc (within the box), embedded on the shaft of the last gearwheel, indicated the distance traveled.
From "Ancient Greek Technology" exhibition at the Evagoras & Kathleen Lanitis Centre in Carob Mill Limassol Replicas and Reconstruction by Prof . Kostas Kotsanas and his students
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