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An octant. The octant, also called reflecting quadrant, is a measuring instrument used primarily in navigation. . A Description of a New Instrument for taking the Latitude or other Altitudes at Sea [invented by John Hadley]. With directions for its use. [By George Hadley. With a folding plate.]. London : Printed for the Author, 1734. Source: 538.i.30.(7) plate after page 30.
Crédit: Album / British Library
Taille de l'image: 4680 × 3974 px | 53.2 MB
Taille d'impression: 39.6 × 33.6 cm | 1842.5 × 1564.6 in (300 dpi)