Great Caspar Signal - built around tree trunk

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

Photo Category: Geodesy - Triangulation - Towers - Wooden
Photo Location: Northern California
Photo Date: 1878

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Author: NOAA National Geodetic Survey/ NOAA

License: Public Domain Mark 1.0 (Public domain)

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Added On	18th October 2015
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