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pl23_theb2459.jpg

Image

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Permalink

https://www.noaa.gov/media/digital-library-photo/pl23theb2459jpg

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

Credit

NOAA Central Library

Display Date

1855

Collection

Historic Coast & Geodetic Survey

Geodesy

Triangulation

Wooden Towers & Signal Poles

Keywords

Geodesy

Triangulation

Towers

Wooden