File:Radio acoustic ranging and echo sounder graphic.JPG
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Summary
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| Description |
A United States Coast and Geodetic Survey illustration depicting the radio acoustic ranging and echosounding techniques. |
|---|---|
| Source | |
| Date |
Undated; probably ca. late 1930s |
| Author |
Unattributed United States Coast and Geodetic Survey illustration via National Oceanic and Atmospheric Administration (NOAA) Photo Library |
| Permission (Reusing this file) |
U.S. Federal Government illustration in the public domain
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Licensing
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 | This image is a work of the National Oceanic and Atmospheric Administration, taken or made as part of that person's official duties. As works of the U.S. federal government, all NOAA images are in the public domain in the United States. |  |
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 13:42, 6 November 2016 | | 871 × 698 (69 KB) | Mdnavman (talk | contribs) | {{Information |Description = A United States Coast and Geodetic Survey illustration depicting the radio acoustic ranging and echosounding techniques. |Source = http://www.photolib.noaa.gov/htmls/cgs00923.htm |Date =... |
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