Using collimator to align instrument observing stand at top of Bilby tower with
mark in the ground at a triangulation station.
Image ID: cgs00492, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection
• High Resolution Photo Available
of the U.S. Department of Commerce, National Oceanic & Atmospheric
NOAA Central Library
| NOAA Disclaimer
May 12, 2014