pl23_theb1296.jpg
Image
Download ( 1.7 MB )Permalink
https://www.noaa.gov/media/digital-library-photo/pl23theb1296jpg-0Description
Observing absolute value of horizontal component of the Earth's magnetic field.
Credit
Merchant Marine Bulletin, September 1931, p. 33
Display Date
1931
Location
Maryland, Cheltenham Observatory
Collection
Historic Coast & Geodetic Survey
Keywords
Geophysics
Geomagnetism