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![Wooden tower within a tower theb2459.jpg Wooden tower within a tower](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_theb2459.jpg?itok=AX9ceF7s)
Description
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