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Floating Hydrographic Signals
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Coast-Geodetic-Survey
Nautical Charting
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Floating Hydrographic Signals & Tautwire Machine
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Flags on bell and whistle buoys.Using harbor buoys for signals for survey work off the BACHE.Black flags showed up best
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Planting a survey signal buoy.Off LYDONIA or NATOMA
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Constructing a floating buoy signal.Buoy in place.For use by East Coast wiredrag party
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Signal off the Delaware coast.Planted by RANGER
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A floating signal.Photograph in 1931 Hydrographic Manual
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Floating signal off the Delaware coast.Party off of RANGER
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Tautwire measuring machine.By trailing wire astern and counting revolutions, one can determine distances.Used to measure distance between floating hydrographic signals
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