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Acoustic Sounding Systems
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Coast-Geodetic-Survey
Nautical Charting
Soundings
Acoustic Sound Systems
Soundings
Robert Williams with first Fessenden oscillator on the tug Susie D.First successful test of sonic system.Looking for icebergs but also found bottom
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Sonic sounding apparatus on the GUIDE.On the ship GUIDE
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Title page to manual - The Submarine Fathometer.Fathometer invented by Herbert Grove Dorsey of the Sub Signal Corporation.
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Fathometer Filter.From the manual - The Submarine Fathometer
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Fathometer Oscillator.From the manual - The Submarine Fathometer
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Internal View of Fathometer.From the manual - The Submarine Fathometer
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Herbert Grove Dorsey - chief physicist of the Coast and Geodetic Survey.With Dorsey Fathometer - Dorsey came to work with C&GS; in 1926
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Operator using Dorsey Fathometer with flashing light method.Merchant Marine Bulletin No. 9, May 1931
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Leo Otis Colbert with Dorsey Fathometer No. 3.The first effective shallow and deep water echosounder.Operator watched flashing light.On the ship OCEANOGRAPHER
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808 fathometer transducer.Hydrographic Manual 1942.Called first portable sonic sounding device.First acoustic sounding device used on C&GS; sounding boats for shallow water.First use of shallow water fathometer continuous records by C&GS;
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Prototype portable depth recorder used as part of 808 fathometer system.Bulletin 13 of the Association of Field Engineers, 1939, p. 102
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Echometre record from S. S. De Grasse.Crossing over canyon near Georges Bank.Bulletin 4 of the Association of Field Engineers, Dec. 1931, p. 83
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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.
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Various bottom configurations plus bar check record.Hydrographic Manual 1942
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Various bottom configurations.Hydrographic Manual 1942
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Ship on Nantucket Shoals that was subsequently blown up.Fathometer record of remains of ship
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Expanded view of fathometer record of remains of ship
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Outer Nushagak Bay sand waves.Observed on PATHFINDER
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Hydrothermal spring discharging fluid off Pagan Island.Observed on NOAA Ship TOWNSEND CROMWELL
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Running up to bank and loosing trace - then heading back out into bay.Record from PEIRCE launch in Delaware Bay 1985
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