pl23_theb1148.jpg
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https://www.noaa.gov/media/digital-library-photo/pl23theb1148jpg-0Description
Theodolite magnetometer.Fig. No. 29, Report of Superintendent ... 1865
Credit
NOAA Central Library
Display Date
1865
Collection
Historic Coast & Geodetic Survey
Keywords
Geophysics
Instruments
Geomagnetism