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Description found in Archives

Nova & accuratissima totius terrarum orbis tabula nautica variationum magneticarum index juxta observationes Anno 1700 habitas [cartographic material] 



Place of creation



R. & J. Ottens

1 map : hand col. ; 51 x 141 cm on sheet 57 x 151 cm.

Scope and content

This chart shows the results of the first British state-sponsored expedition with a purely scientific purpose. Because the earth's magnetic field is not uniform and, as a result, the mariner's compass points either side of north to a variable degree depending on the ship's position. To make navigation safer, Halley made an extensive series of comparisons between compass readings and determinations of north by astronomical observation. He plotted isogonic lines, joining points of equal magnetic variation.

Cartographic material
90: Open
Original can be viewed in the presence o
f an early cartographic archivist. Microfiche version is open.
Cartographic material
Microfiche NMC27713
90: Open
Item no. (creator)
Alexander E. MacDonald Canadiana Collection Item #57
Cartographic material
90: Open
57 Item no. assigned by LAC 57
90: Open
Archival reference no.
Other accession no.
80101/245 CA

Terms of use

Credit Library and Archives Canada.
Copyright expired.

Additional name(s)

Additional information

"52" appears in bottom right margin

Map of the world showing lines of magnetic variation.

Cartouche: Latin title, top centre, has female personifications of astronomy, navigation and geometry. Cartouche: Latin text celebrating the invention of the magnetic compass.

Inset: north pole, semi-polar azimuth projection.

Cartouches: Latin dedication to Queen Anne, English dedication to Prince George of Denmark

First published separately in 1702 by the London map publishers Mount and Page, the chart was copied by Pieter Mortier soon after, followed by the present edition by the map publishers Reinier and Josua Ottens, which they included in their 1745 edition of Louis Renard's maritime atlas and in other atlases that they assembled and sold to order in the 1730s and 1740s.

Custodial history
Part of the Alexander E. MacDonald Canadiana Collection purchased by the Public Archives of Canada in 1981.

Cartographic math data
Scale [ca. 1:32 000 000](W180°--E 180°/N 60°--S 40°)

Citation / reference note
Koeman, vol. 4, Entry REN 3, map no. 4

Availability of other formats note
The microfiche version is NMC 27713

Subject heading

1. World - Maps - Early works to 1800.