-MiAP lO. ^ Jour. So. Coll. Vol. XIV. PI. XCVII, 



MAGNETIC DISTURBING FORCES. 



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Black lines indicate the Directions ,inâ Maifiuludes of I he H,irl.:iii,tiil Coniponenta 0/ 'l-l ,, ,.-■ ■ ■ '''"^^"TP^' v 



Disturbinfi Farces. ]o*4P^-" -", î**—.^-'*^ 



Blue Lines indicate the Magnitudes of Dmimward Compunents 'if Disturbing Forces. I T^' iC-i.^ »)'«■*>- "' '\ 



B«i Lin« indicate the Magnitudes of Uptcard Components of Disturbing Forces. \ -jii..^, ï'î'T j^ -" y|^'g.>-~-^°~''^ 1 



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