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Description
Collimating the inner tower at Station Winnie.Collimation involved placing the observing instrument directly over the mark.Triangulation party of Carl I. Aslakson (Image credit: Captain Ray Tryon, C&GS;)
Credit
Captain Ray Tryon, C&GS;
Display Date
21-Aug-34
Location
Itasca County, Minnesota
Collection
Historic Coast & Geodetic Survey
Geodesy
Triangulation
Bilby Steel Towers
Keywords
Geodesy
Triangulation
Towers
Bilby Steel