Double sounding chair arrangement.
Effort to double density of soundings.
Working off of HYDROGRAPHER in 20 to 25 fathoms
Image ID: theb2126, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection
Location: Gulf of Mexico
Photo Date: 1917
Credit: C&GS Season's Report Seran 1917-94
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July 7, 2015