Pocket box sextant made by the company of William Cary, Strand, City of Westminster, London, England, 1845-1855. Consists of two circular lacquered brass plates with lid that acts as a handle when used. Fitted with Inlaid silver 135° scale (-5° to 145°) with 30' divisions and a silver vernier (1' div.). The index arm is rotated by a milled knob on the upper plate with two filter shades (red & green) operated by lever. The index glass is fixed with adjustment for the horizon glass. Fitted with magnifier (single lens) on hinged 45 mm swivel arm, 50mm telescope and choice of a large and a small pinhole.