Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock () or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

pl23_theb1791.jpg

Using dynamite to excavate a bench mark hole

Image

Download ( 310 KB )

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

Keywords

Geodesy

Leveling