Collimating the inner tower at Station Winnie

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

Photo Category: Geodesy - Triangulation - Towers - Bilby Steel
Photo Location: Itasca County, Minnesota
Photo Date: August 21, 1934

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Author: Captain Ray Tryon, C&GS/ NOAA

License: Public Domain Mark 1.0 (Public domain)

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Added On	18th October 2015
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