pl23_theb1142.jpg
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https://www.noaa.gov/media/digital-library-photo/pl23theb1142jpgDescription
Magnetometer and altazimuth instrument.Plate III, Fig. No. 9, Appendix No. 8, Report of Superintendent ... 1894, p. 276
Display Date
1894
Collection
Historic Coast & Geodetic Survey
Keywords
Geophysics
Instruments
Geomagnetism