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 ID: theb2459, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection
Photo Date: 1855
Credit: NOAA Central Library
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of the U.S. Department of Commerce, National Oceanic & Atmospheric
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April 30, 2013