pl23_map00007.jpg
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https://www.noaa.gov/media/digital-library-photo/pl23map00007jpgDescription
Top panel same as image map00006. Bottom panel demonstrates method ofdetaching weight and retrieving bottom sample such that the surveyor would atleast know that the sounding weight had reached bottom. However, this did notimprove the accuracy of the sounding.
Credit
NOAA Central Library Historical Collection
Category
Voyage to Inner Space
History of Oceanography Collection
Bathymetric Maps Collection
Keywords
Exploration
Maps