n

opisometer (прибор для измерения длины кривой линии на чертеже || An opisometer, also called a curvimeter, meilograph, or map measurer, is an instrument for measuring the lengths of arbitrary curved lines.

measuring wheel; perambulator

hydrol.

contour tracing apparatus

instr.

map measurer (wikipedia.org); meilograph (wikipedia.org)

math.

curvometer (also: CURVIMETER: an instrument for measuring the length of a curve, the simplest form consisting essentially of a wheel that is rolled tangentially along the curve and a recording dial

contour tracing apparatus apparatus

techn.

curvimeter; opisometer; map measurer

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