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![Survey tower with signal pole and tin cone theb2460.jpg Survey tower with signal pole and tin cone](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_theb2460.jpg?itok=TnY-E88r)
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