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https://www.noaa.gov/media/digital-library-photo/pl23cgs02457jpgDescription
Observing tower at Station Pen in Washington state. The towerwas built around a tree trunk which was stripped of branches. The tree trunkserved as the instrument stand. Observer was J. S. Hill, Chief of Party O. B.French. (Image credit: Collection of NOAA/NOS/National Geodetic Survey William H. Burger Album)