pl23_theb2473.jpg
Description
Jasper S. Bilby observing from reconnaissance pole attached to tree.Top of pole is 104 feet above ground.Checking for intervisibility between stations.Helping plan for necessary height of tower at station
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