pl23_theb1793.jpg
![Driving pin for steady rod support theb1793.jpg Driving pin for steady rod support](https://s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_theb1793.jpg)
Description
Driving pin for steady rod support.Level party of Al Thorson
Credit
C&GS; Season's Report Thorson 1933
Display Date
1933
Collection
Historic Coast & Geodetic Survey
Geodesy
Determining the Elevations - Leveling a Continent
Keywords
Geodesy
Leveling