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Casts of the Lead
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Coast-Geodetic-Survey
Nautical Charting
Soundings
Casts of the Lead
Soundings
Leadline survey from catamaran hull.
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Leadline sounding operations.Wind that sucker up and let her fly
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Frontispiece from the Hastings Rutter - 1450 A.D. early English pilot guide.Possibly first picture of leadline sounding
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Sailor sounding from merchantman - Nineteenth Century.Sketch by Gordon Grant
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Double sounding chair arrangement.Effort to double density of soundings.Working off of HYDROGRAPHER in 20 to 25 fathoms
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(774.62 KB)
Double sounding chair arrangement.Effort to double density of soundings.Working off of HYDROGRAPHER in 20 to 25 fathoms
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(519.47 KB)
Double sounding chair arrangement.Effort to double density of soundings.Working off of HYDROGRAPHER in 20 to 25 fathoms
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Taking the reading when the line is vertical
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Boatswain Jahnke casting the lead.Launch off the SURVEYOR
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Casting the lead - Hydro Manual 1931
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Casting the lead - Hydro Manual 1931
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Leadline is vertical for reading.Working off the WESTDAHL
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Tossing the leadline.Working off the WESTDAHL.Note splash of lead out ahead of ship
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Sounding in Salton Sea for seaplane landing site.Part of war project to establish seaplane landing sites.Sites used for ferrying seaplanes across United States
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