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![Driving pin for steady rod support theb1793.jpg Driving pin for steady rod support](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_theb1793.jpg?itok=nJz92Js5)
Description
Driving pin for steady rod support.Level party of Al Thorson (Image credit: C&GS; Season's Report Thorson 1933)
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