This chart, printed on two sheets, came from a series of 8 maps published in the scarce mineralogy section of Buffon's Historie Naturelle. The variations in terrestrial magnetism at different points on the earth's surface are indicated throughout the map, especially along the western coast of Africa and eastern coast of South America. Only the outlines of the continents are depicted along with a few place names. If joined together, the chart would measure 20.5 x 33.5".

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Condition: B

Issued folding on heavy, watermarked paper with moderate offsetting and light scattered foxing. Please note that the blue hue in the image is caused by our scanner and not in the physical map.