Tautwire measuring machine.
By trailing wire astern and counting revolutions, one can determine distances.
Used to measure distance between floating hydrographic signals
Image ID: theb2220, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection
Location: New York Bight area
Photo Date: 1939
Credit: Chief Electronics Technician Angelo Ferrara, C&GS
Category: Charting/Navigation/Visual Signals/Floating/
• High Resolution Photo Available
of the U.S. Department of Commerce, National Oceanic & Atmospheric
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July 7, 2015