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
3/18/2019 3:06:42 PM
Date: 1905
Credit: NOAA, John Hayford Album
Location: Washington
Subject: Geodesy
Subject: Triangulation
Subject: Towers
Subject: Wooden