pl23_theb2537.jpg
Description
Collimating the inner tower at Station Winnie.Collimation involved placing the observing instrument directly over the mark.Triangulation party of Carl I. Aslakson
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