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https://www.noaa.gov/media/digital-library-photo/pl23theb3791jpgDescription
Robert Peary North Pole Expedition.Sounding with piano wire through the ice.Profile of soundings tends to corroborate that Peary made it to the North Pole. (Image credit: National Geographic Magazine, September 1988)
Credit
National Geographic Magazine, September 1988
Display Date
1909
Location
Arctic Ocean Photo
Category
Historic Coast & Geodetic Survey
Nautical Charting
Bathymetry - Mapping the Features
Pre-1920
Keywords
Charting
Soundings
Bathymetry
Mechanical