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https://www.noaa.gov/media/digital-library-photo/pl23theb2459jpg-0Description
Wooden tower within a tower.Outer tower supports personnel - inner tower supports instrument.First devised by Assistant Edmund Blunt to see over marshes in Delaware Bay area (Image credit: NOAA Central Library)
Credit
NOAA Central Library
Display Date
1855
Collection
Historic Coast & Geodetic Survey
Geodesy
Triangulation
Wooden Towers & Signal Poles
Keywords
Geodesy
Triangulation
Towers
Wooden