Collimating a 100-foot tower over the station mark

Collimating a 100-foot tower over the station mark. This is basically centering the observing stand on the interior of the tower over the station mark so that angle observations are made directly over the mark.

Photo Location: California, Palo Alto
Photo Date: 1932 March

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Author: Mr. Floyd Risvold, USC&GS/ NOAA

License: Public Domain Mark 1.0 (Public domain)

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Added On	16th October 2015
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