pl23_theb1146.jpg
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https://www.noaa.gov/media/digital-library-photo/pl23theb1146jpgDescription
Duplex measures, making the final contact.Contact meant bringing the two aligned bars together so the ends were touching. Fig. No. 7, Appendix No. 3, Report of Superintendent ... 1901, p. 244.
Display Date
1901
Collection
Historic Coast & Geodetic Survey
Keywords
Geodesy
Base Line