A publisher’s proof of great magnitude

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"Carte sur la quelle en marquee la route de l'Uranie a l'equateur magnetique..."

.... "planche pour le volume pour magnetisme" (verso).

FREYCINET, Louis Claude de Saulces de; and HACQ, Jacques Marie
[Paris,
Imprimerie Royale for Pillet Aine,
1826-1842].
Engraved chart, proof before letters, with contemporary annotations, on wove paper watermarked "J. Whatman".
620 by 325mm (24.5 by 12.75 inches).
22739

To scale:

notes:

notes:

Publisher's proof of the folding engraved chart that would be included in volume VI of Freycinet's 'Voyage autour du Monde' (1824-1844), 'Magnetisme terrestre' (1842), as 'Tracé de l'Equateur magnétique pour les époques moyennes de 1773 et 1821, 1826', by Jacques Marie Hacq, after Freycinet, and (probably) Brue.

The chart shows the track of Freycinet's ship, the 'Uranie', as well as three lines of variation of the magnetic equator in 1773, 1800 (after Humboldt's ...

bibliography:

bibliography:

Hill, 'Pacific', 649.

provenance:

provenance:

Provenance
1. With annotations probably in the hand of Louis Claude de Saulces de Freycinet;
2. Freycinet family archives