Magnetometer and altazimuth instrument. Plate III, Fig. No. 9, Appendix No. 8, Report of Superintendent ... 1894, p. 276
Image ID: theb1142, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection Photo Date: 1894 Category: Geophysics/Instruments/Geomagnetism/ • High Resolution Photo Available
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