Early graphic record from Sub Signal system.
Off S.S. Yarmouth between Boston and Yarmouth.
Bulletin 6 of the Association of Field Engineers, Dec. 1932, p. 60.
Image ID: theb2158, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection
Credit: Association of Commissioned Officers
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of the U.S. Department of Commerce, National Oceanic & Atmospheric
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