Abstract
WITH reference to the letter in Nature1 from Guro Gjellestad and Helge Dalseide it should be noted that the last published British Admiralty chart of declination (epoch 1960.G) does show a decrease in the annual change over the area in question, when compared with the previous chart. The isopors (lines of equal annual change) shown on the 1960 chart are given in Fig. 1 (full) together with those found for 1958 by Gjellestad and Dalseide (dotted).
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Nature, 196, 55 (1962).
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FINCH, H. Annual Change in the Declination (‘Variation’) in Western Scandinavia and the North Sea. Nature 197, 67 (1963). https://doi.org/10.1038/197067a0
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DOI: https://doi.org/10.1038/197067a0
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