An isodynamic chart of Canada from 1961, showing zones of horizontal intensity of geomagnetic fields.
H - isodynamic chart, Canada, 1965.0 (lines of equal horizontal magnetic intensity and equal annual change)
Canada. Surveys and Mapping Branch
Dominion Observatories (Canada)
Department of Mines and Technical Surveys Canada
1 map : colour ; 86 x 95 cm, on sheet 91 x 100 cm
ImageMill Imaging Library v3.000 2013
Lambert conformal conical projection, standard parallels 49° and 77°. Modified polyconic projection north of latitude 80°.
Shows zones of horizontal intensity of geomagnetic fields, also waterways, cities and towns.
In lower left margin: H 1965.0.
Scale 1:6,336,000 or 100 miles to 1 inch.
Material digitized as part of an Academic Innovation Fund (AIF), awarded in 2018. For more information see: http://avptl.info.yorku.ca/academic-innovation-fund/ .