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Description
Survey tower with signal pole and tin cone.At west end of Epping Base Line.Survey monument shows below tower.Stakes on graded surface were for aligning base measuring instruments (Image credit: NOAA Central Library)
Credit
NOAA Central Library
Display Date
1857
Location
Maine, Epping Plains
Collection
Historic Coast & Geodetic Survey
Geodesy
Triangulation
Wooden Towers & Signal Poles
Keywords
Geodesy
Triangulation
Towers
Wooden