Friction Roller Bearing, fiction wheel. A Pitometer Replacement Part For the master speed indicator On the Underwater Log System. This item is NEW.  Part Number: S2641

Have a unique part of history. Pitometer logs (also known as pit logs) are devices used to measure a ship's speed relative to the water. They are used on both surface ships and submarines. Data from the pitometer log is usually fed directly into the ship's navigation system

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