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pl23_ship3098.jpg

A diagram of the old wiredrag system as developed by Nicholas Heck, Jean Hawley, and others in the U

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https://www.noaa.gov/media/digital-library-photo/pl23ship3098jpg

Description

A diagram of the old wiredrag system as developed by Nicholas Heck, Jean Hawley, and others in the U. S. Coast and Geodetic Survey. Prior to the development ofsidescan sonar, this was the only method to find protrusions from the bottomthat occurred between sounding lines. This diagram was published in theMilitary Engineer, 1924, p. 228.

Collection

Voyage to Inner Space

Keywords

Historical Ships

Soundings