A Kelvin Tide Predicting Machine ca. 1926. This particular model was used by
Japan, Portugal, and the Tidal Institute of Glasgow.
Image ID: theb4105, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection
• High Resolution Photo Available
of the U.S. Department of Commerce, National Oceanic & Atmospheric
NOAA Central Library
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April 30, 2013