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https://www.usa.gov/copyrighted-government-workshttps://www.rawpixel.com/image/4051495
Proportional DividerCartographers used this device to proportionally convert distances on one map to distances on enlarged…
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Proportional Divider
Cartographers used this device to proportionally convert distances on one map to distances on enlarged or reduced copies. After setting the desired scale difference (10-110 percent), one end measured the original map and the other end marked the scaled copy. 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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Proportional Divider
Cartographers used this device to proportionally convert distances on one map to distances on enlarged or reduced copies. After setting the desired scale difference (10-110 percent), one end measured the original map and the other end marked the scaled copy. Original public domain image from Flickr

More