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REFINE
Browse All : Thematic Atlas and Geomagnetism and National Atlas of Canada
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Author
[Canada. Department of Mines and Technical Surveys, Nicholson, N. L. (Norman Leon), Comtois, Paul]
Note
4 maps showing earthquake, magnetic and tidal data in Canada. 2 maps 27 x 32 cm, 1 map 19 x 32 cm, 1 map 27 x 17 cm. Each includes a scale statement. 2 of the maps include a legend. Lambert Conformal Conic Projection Standard Parallels 49˚N and 77˚N. With 3 insets (each include a legend): Earthquake probability (9 x 13 cm) -- Diurnal co-tidal and co-range lines east coast (11 x 15 cm) -- Diurnal co-tidal and co-range lines west coast (8 x 15 cm). Descriptive text on verso: 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 ... [Date of map inferred based upon atlas data.]
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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