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WHO

  1. Canada. Department of Min … (1)
  2. Comtois, Paul (1)
  3. Department of Mines and T … (1)
  4. Nicholson, N. L. (Norman … (1)

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  1. 1957 (1)
  2. 1958 (1)
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Text: (18) Earthquakes, magnetism and tides.
Canada. Department of M...
Text: (18) Earthquakes,...
1957
[National Atlas, Themat...
 
Author
[Canada. Department of Mines and Technical Surveys, Nicholson, N. L. (Norman Leon), Comtois, Paul]
Note
Descriptive text on verso of (18) Earthquakes, magnetism and tides: Since the North Magnetic Pole is in a different position from the Geographical North Pole, and since the lines of the earth's magnetic forces are deflected by various agencies, the compass needle does not point toward the Geographical North Pole in most locations. The deflection of the compass needle from True North is called magnetic variation or declination ...
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