Agonic line
Nuttall Encyclopedia · 1907 · p. 1
line along which the needle points due north and south.
Bu kavram başka kaynaklarda da geçiyor
Hawkins' Electrical Dictionary (1915)
The American Dictionary and Cyclopedia (1907)
The Standart Electrical Dictionary (1892)
Zell's Condensed Dictionary (1879)
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