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Compensating Polar PlanimeterCartographers used this German-made device to assist in accurately measuring the area of a…
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Compensating Polar Planimeter
Cartographers used this German-made device to assist in accurately measuring the area of a plane. By tracing the map outline of the plane, they could calculate the area from the dial reading. Original public domain image from Flickr

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Public DomainFree CCO U.S. Government image for Personal and Business use

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Compensating Polar Planimeter
Cartographers used this German-made device to assist in accurately measuring the area of a plane. By tracing the map outline of the plane, they could calculate the area from the dial reading. Original public domain image from Flickr

More