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https://www.noaa.gov/media/digital-library-photo/pl23ship3203jpgDescription
An early published diagram of the principle of echo-sounding. Published inSpecial Publication No. 3 of the International Hydrographic Bureau, October 1924. This is among the earliest of published diagrams of the echo-soundingprinciple. (Image credit: Archival Photography by Steve Nicklas)
Photographer
Archival Photography by Steve Nicklas
Collection
Voyage to Inner Space
NOAA Affiliation
NOS