File:Triangular 24-Inch Engineering Scale (30245415043).jpg

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Description Cartographers used this tool to take linear measurements from maps and scale diagrams. If two of its six available scales matched those of a map original and desired copy, the tool could be used to accurately make a scaled copy.
Date
Source Triangular 24-Inch Engineering Scale
Author Central Intelligence Agency from Washington, D.C.

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Public domain This image is a work of a Central Intelligence Agency employee, taken or made as part of that person's official duties. As a Work of the United States Government, this image or media is in the public domain in the United States.

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This image was originally posted to Flickr by The Central Intelligence Agency at https://flickr.com/photos/59094030@N08/30245415043. It was reviewed on 20 December 2016 by FlickreviewR and was confirmed to be licensed under the terms of the United States Government Work.

20 December 2016

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current00:05, 20 December 2016Thumbnail for version as of 00:05, 20 December 20165,184 × 3,456 (951 KB)Mindmatrix (talk | contribs)Transferred from Flickr via Flickr2Commons

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