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Description
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 credit: NOAA, John Hayford Album)
Credit
NOAA, John Hayford Album
Display Date
1905
Location
Washington
Collection
Historic Coast & Geodetic Survey
Geodesy
Triangulation
Wooden Towers & Signal Poles
Keywords
Geodesy
Triangulation
Towers
Wooden