Nova & accuratissima totius terrarum orbis tabula nautica variationum magneticarum index juxta observationes anno 1700 habitas constructa.

Engr., on 3 sheets, together 52,2 x 142,4 cm, hand-coloured (min. marg. damp stains in upper edge not touching pl., light traces of folds).

Edges enlarged and reinforced with laid paper, c. 8,5 cm (few spots).

Early Dutch edition of the famous isogonic world chart by Edmond Halley (1656-1742), English astronomer, mathematician and physicist. Halley published his observations on the conditions of terrestrial magnetism in 1701 as the "General chart of the Variation of the Compass", the first map showing isogonic lines, connecting points of equal magnetic variation in the ocean, making it one of the most important maps of the 18th c. This impressive mural map, published by Ottens, follows the Mercator projection and centers the America's, depicting California as an island, and repeats Eastern Asia and Australia at both edges. It also contains a half-hemisphere map of the North Pole. Verso blank.
Ref. Shirley, p. xiv. - Koeman IV Ren3 (4). - Tooley's Dictionary II:254-256.