pl23_theb1307.jpg
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https://www.noaa.gov/media/digital-library-photo/pl23theb1307jpgDescription
A Z-Variometer.Instrument measures relative changes in vertical component of Earth's magnetism
Credit
C&GS; Season's Report Shelton 1954-15
Display Date
1954
Collection
Historic Coast & Geodetic Survey
Keywords
Geophysics
Geomagnetism