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![Duplex bar No theb1156.jpg Duplex bar No](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_theb1156.jpg?itok=6J4jUUZl)
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https://www.noaa.gov/media/digital-library-photo/pl23theb1156jpgDescription
Duplex bar No. 15 on its trestles.Figure No. 5, Appendix No. 11.Part II, Report of the Superintendent ... 1897, p. 483. (Image credit: NOAA Central Library)
Credit
NOAA Central Library
Display Date
1897
Collection
Historic Coast & Geodetic Survey
Keywords
Geodesy
Base Line
Instruments