Station Pen in Washington.
Triangulation party of O. B. French - occupied by J. S. Hill.
Instrument was mounted on tree trunk.
Instrument remained steady in azimuth but unsteady in level
Image ID: theb2483, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection
Photo Date: 1905
Credit: NOAA, John Hayford Album
• High Resolution Photo Available
of the U.S. Department of Commerce, National Oceanic & Atmospheric
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April 30, 2013