Map of the world showing lines of magnetic variation. Relief shown by isolines. Inset: Polar projection [North Pole] W 90*00'--E 90*00'. Part of the Eastern sheet repeated on the West. Numbered "52" in right bottom corner, possibly plate from the Atlas Minor issued by R. & J. Ottens during 1725-50. Map lacks note "Cap de la Circoncision ontdekt den 1 January 1739" which appears on a later edition.