pl23_theb1296.jpg
![Observing absolute value of horizontal component of the Earth's magnetic field theb1296.jpg Observing absolute value of horizontal component of the Earth's magnetic field](https://s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_theb1296.jpg)
Description
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