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pl23_theb1791.jpg

Using dynamite to excavate a bench mark hole

Image

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Permalink

https://www.noaa.gov/media/digital-library-photo/pl23theb1791jpg

Description

Using dynamite to excavate a bench mark hole.Note dirt flying out of hole.Level party of H. J. Oliver

Credit

C&GS; Special Report Oliver 1932

Display Date

1932

Location

Northern California

Collection

Historic Coast & Geodetic Survey

Geodesy

Determining the Elevations - Leveling a Continent

Keywords

Geodesy

Leveling