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Rolling Disc PlanimeterCartographers used this German-made device to accurately measure the size of an area on a map or plan…
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Rolling Disc Planimeter
Cartographers used this German-made device to accurately measure the size of an area on a map or plan by tracing the area’s outline. The area calculation used the resulting 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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Rolling Disc Planimeter
Cartographers used this German-made device to accurately measure the size of an area on a map or plan by tracing the area’s outline. The area calculation used the resulting dial reading. Original public domain image from Flickr

More