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Description
John F. Hayford observing from 60' reconnaissance pole.On 98th Meridian Survey.Checking for intervisibility between stations.Helping plan for necessary height of tower at station (Image credit: NOAA, John Hayford Album)
Credit
NOAA, John Hayford Album
Display Date
1903
Location
Minnesota
Collection
Historic Coast & Geodetic Survey
Geodesy
Triangulation
Wooden Towers & Signal Poles
Keywords
Geodesy
Triangulation
Towers
Wooden