Jan-6th-2009
Magnetic Elements
The qualities of the terrestrial magnetism at any place as expressed in
its action upon the magnetic needle. Three data are involved.
I. The Declination or Variation.
II. The Inclination or Dip.
III. The Force or Intensity.
I. The Declination is the variation expressed in angular degrees of the
magnetic needle from the true north and south, or is the angle [...]