pl23_theb2459.jpg
![Wooden tower within a tower theb2459.jpg Wooden tower within a tower](https://s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_theb2459.jpg)
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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
Credit
NOAA Central Library
Display Date
1855
Collection
Historic Coast & Geodetic Survey
Geodesy
Triangulation
Wooden Towers & Signal Poles
Keywords
Geodesy
Triangulation
Towers
Wooden