Box for brass framed pocket sextant.
Box for pocket sextant made by John Dollond, London, about 1800.
Pocket sextant made by John Dollond, London, about 1800. Lacquered brass frame and limb, a hinged wooden handle. Signed on the index arm: Dollond London. Inlaid silver scale from -2° to 154° every 30', measuring to 129° (digits read from the pivot). Silver vernier to 1', zero at the left. There is no tangent or clamping screw; the index arm is moved by a milled knob along a rack on the back of the limb. One shade (red). Index- and horizon-glass adjustment by screws. Magnifier (single lens) on a 25 mm swivelling arm. Telescope bracket without adjustment. Telescope (43 mm) erect image, a sliding shade (red). With box.
Box for pocket sextant made by John Dollond, London, about 1800.