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Level rod holding on pin driven in ballast to the point where it wassecure and not moving

Image

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Permalink

https://www.noaa.gov/media/digital-library-photo/pl23cgs02452jpg

Description

Level rod holding on pin driven in ballast to the point where it wassecure and not moving. (Image credit: Collection of NOAA/NOS/National Geodetic Survey William H. Burger Album)

Credit

Collection of NOAA/NOS/National Geodetic Survey William H. Burger Album

Keywords

Coast and Geodetic Survey