Abstract
SINCE the year 1701, when Halley published his famous chart showing curves of equal magnetic variation for the Atlantic and Indian Oceans, the construction of similar charts, amended and enlarged as data increased, has been of great interest to magnetic science and of practical value to the navigator.
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On Some Recent Charts and Maps of Curves of Equal Magnetic Variation or Delination . Nature 23, 314–315 (1881). https://doi.org/10.1038/023314e0
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DOI: https://doi.org/10.1038/023314e0