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
• High Resolution Photo Available
of the U.S. Department of Commerce, National Oceanic & Atmospheric
NOAA Central Library
| NOAA Disclaimer
June 10, 2016