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Description
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 sothat angle observations are made directly over the mark. (Image credit: Mr. Floyd Risvold)
Photographer
Mr. Floyd Risvold
Display Date
1932 March
Location
California, Palo Alto
Collection
Historic Coast & Geodetic Survey
Geodesy
Oscar and Floyd Risvold
NOAA Affiliation
USC&GS;