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Nineteenth Century Instrument Orthogonal Plane Meter

Nineteenth Century Instrument Orthogonal Plane Meter

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Orthogonal planer is an instrument for measuring the area of a plane, invented around 1851. Its design is based on the principle of orthogonality, and its area is calculated by measuring the boundary of the plane figure. Orthogonal planometers usually consist of a rod with a scale and a moving pointer. The user can record the measurement data by moving the pointer along the boundary of the figure.

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