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“A modified BC-4 satellite triangulation camera used in the world-wide triangulation program. The original BC-4 had a 350 mm focal length while the modified camera used in the program had a 450mm focal length.”
Image ID: geod0005, NOAA’s Geodesy Collection. Scan of 2 d image in the public domain believed to be free to use without restriction in the US.
Art – Photographs, Miscellaneous
Science – Astronomy – Photo – Satellite triangulation camera
. Swivelchair Media. 