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.
Image ID: ship3203, Voyage To Inner Space - Exploring the Seas With NOAA Collect Photographer: Archival Photography by Steve Nicklas, NOS, NGS
