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Description
Signal at Stillpond, Maryland.Instrument height of 120 feet - top of signal 275 feet.39th Parallel Survey.Record signal height from wooden tower (Image credit: NOAA Central Library)
Credit
NOAA Central Library
Display Date
1880?
Location
Maryland
Collection
Historic Coast & Geodetic Survey
Geodesy
Triangulation
Wooden Towers & Signal Poles
Keywords
Geodesy
Triangulation
Towers
Wooden