pl23_theb1136.jpg
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https://www.noaa.gov/media/digital-library-photo/pl23theb1136jpg-0Description
Cut-off, i.e. flashlight, in use at night on comparator.Night-time operations in comparing lengths of steel tapes.Fig. No. 13, Appendix No. 3, Report of Superintendent ... 1901, p. 258
Display Date
1901
Collection
Historic Coast & Geodetic Survey
Keywords
Geodesy
Base Line