pl23_theb2460.jpg
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https://www.noaa.gov/media/digital-library-photo/pl23theb2460jpg-0Description
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
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