Declinometer
Everybody's Encyelopedia · 1912 · p. 4
an instrument for determining the magnetic declination, and for observing its variations, especially those due to magnetic storms.
Bu kavram başka kaynaklarda da geçiyor
Hawkins' Electrical Dictionary (1915)
The American Dictionary and Cyclopedia (1910)
Chandler's Encyclopedia (1898)
Nuttall's Standard Dictionary of the English Language (1890)
Zell's Condensed Dictionary (1879)
Dictionary of Science, Literature and Art (1842)
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