F6420-001

Sextant Long Caption: This is reputed to have been used on Cook's third voyage (1776-1780). The Maskelyne flap consists of a hinged brass flap that can be used to obscure the lower (silvered) half of the index glass. Credit line: © National Maritime Museum, Greenwich, London. Acquired with the assistance of the National Heritage Memorial Fund. Object: NAV1236 Artist: Jesse Ramsden Date: circa 1772 Medium: brass Size: Overall: 425 mm x 445 mm x 95 mm Click here to buy a bespoke print of this image.