Antique OpIsometer NAUTICAL MILES MAP METER GUAGE American Map co. Made Germany

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Antique OpIsometer NAUTICAL MILES MAP METER GUAGE American Map co. Made Germany:
$12.00

In great working condition ready to use or ready to display

An opisometer, also called a curvimeter, meilograph, or map measurer, is an instrument for measuring the lengths of arbitrary curved lines. A simple opisometer consists of a toothed wheel of known circumference on a handle. The wheel is placed in contact with the curved line to be measured and run along its length.