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NOAA Photo Library Image - theb3768

Sounding machine devised by Robert Hooke. Drop glass ball with weight over side. Ball disengages when weight hits bottom. Known rate of descent and ascent - can then derive depth. Never worked right.

Image ID: theb3768, Voyage To Inner Space - Exploring the Seas With NOAA Collect
Credit: NOAA Central Library

Category: Charting/Soundings/Bathymetry/Mechanical/

High Resolution Photo Available





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Last Updated:
April 30, 2013