An early published diagram of the principle of echo-sounding

An early published diagram of the principle of echo-sounding. Published in Special Publication No. 3 of the International Hydrographic Bureau, October 1924 . This is among the earliest of published diagrams of the echo-sounding principle.

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Author: Archival Photography by Steve Nicklas, NOS, NGS/ NOAA

License: Public Domain Mark 1.0 (Public domain)

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