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$5

Compensating Polar Planimeter

Last updated 7 days ago in Monterey Park, CA

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Lisa

Lisa

Joined Jun 2019

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(36) offer up reviews

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Description

compensating polar planimeter A precision mechanical instrument used to measure the area of an irregular flat shape on a map, drawing, or photograph by tracing its outer boundary. How It WorksTwo Arms: The device consists of a weighted "pole arm" that stays fixed to a single pivot point and a "tracer arm" with a magnifying glass and pointer that moves along the shape's perimeter.Measuring Wheel: As you trace the outline, a small wheel on the tracer arm rolls and slides across the paper, automatically calculating the area using mathematical principles related to line integrals (Green's theorem).

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Used (normal wear)

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