Adjusting various constituent gears for predicting tide at a specific location
on the surface of the earth. Tide-prediction machine No. 2, "Old Brass Brains."
Image ID: cgs01643, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection
Location: Washington, D.C.
Photo Date: 1939 Circa
• High Resolution Photo Available
of the U.S. Department of Commerce, National Oceanic & Atmospheric
NOAA Central Library
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June 10, 2016