SUCCESSIVE DISPLACEMENTS OF THE AGONIC LINE
Eastern United States
1893 Historical Map - Wood Engraving

Approx Image Size: 5 3/4 x 4 1/4 ins
Overall Page Size: 10 1/2 x 7 ins

PRINT SHOWS: The magnetic declination (also known as grid magnetic angle in military circles) at any point on the Earth is the angle between the local magnetic field -the direction the north end of a compass points -- and true north. The declination is positive when the magnetic north is east of true north. The term magnetic variation is equivalent, and is more often used in aeronautical and other forms of navigation. Isogonic lines are where the declination has the same value, and the lines where the declination is zero are called agonic lines.

Excellent Condition. Map Image is clean, clear, sharp with beautiful detail. Intext Bookplate Map with Text on the back. Printed on cream color coated paper.

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