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Description
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 credit: Association of Commissioned Officers)
Credit
Association of Commissioned Officers
Collection
Historic Coast & Geodetic Survey
Nautical Charting
Soundings
Acoustic Sound Systems
Keywords
Charting
Soundings
Fathogram