One of the earliest diagrams of echo-sounding

One of the earliest diagrams of echo-sounding in a published work. Source: In Die Meteor-Fahrt Forschungen, The Meteor Expedition (1928) by F. Speiss.

Citation: In Die Meteor-Fahrt Forschungen, The Meteor Expedition (1928) by F. Speiss. Fahrt Forschungen und Erlebnisse der Deutschen Atlantischen Expedition, 1925-1927. D. Reimer, Berlin. (NOAA Photo Library.)

Related Links

History: Technology Quotations

History: Quotations

NOAA Ocean Explorer Gallery: History