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pl23_theb2183.jpg

Flash and sound ranging survey as practiced by Charles Wilkes

Image

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Permalink

https://www.noaa.gov/media/digital-library-photo/pl23theb2183jpg

Description

Flash and sound ranging survey as practiced by Charles Wilkes.Shoot cannon - see flash - measure time till hear sound - determine distance

Display Date

1839

Location

South Pacific atoll

Collection

Historic Coast & Geodetic Survey