Diagram of the projection ruling machine of the U.S. Coast and Geodetic Survey.
Image ID: cgs01174, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection
Category: Coast and Geodetic Survey/Instruments/Projection Ruling Machine/
• High Resolution Photo Available
of the U.S. Department of Commerce, National Oceanic & Atmospheric
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April 30, 2013