Front indicator panel showing traced tide curve and various dials related to
predicting tide with Tide Prediction machine No. 2, "Old Brass Brains."
Image ID: cgs01641, 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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April 30, 2013