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NOAA Photo Library Image - theb2468

Great Caspar Signal - built around tree trunk. Note boatswain chair transporting man to top. 135-foot signal --- main wood scaffold supports instrument. Tree trunk supports small scaffolding and observer at top. Western terminus of 39th Parallel Survey

Image ID: theb2468, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection
Location: Northern California
Photo Date: 1878
Credit: NOAA National Geodetic Survey

Category: Geodesy/Triangulation/Towers/Wooden/

• High Resolution Photo Available




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Last Updated: April 30, 2013