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LicensePocket sextant made by John Dollond, London, about 1800
Science Museum Group
© The Board of Trustees of the Science Museum
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. Polished brass scale from -2° to 154°
every 30', measuring to 126° (digits read from the pivot). Brass vernier to 1', zero at the left. There is no tangent screw; the clamping screw is on the back of the index arm. Two shades (red and green). Index- and horizon-glass adjustment by screws. Magnifier (single lens) on a 48 mm swivelling arm. Sight vane with one pinhole and a swivelling shade (missing). A fitted square mahogany box.
Details
- Category:
- Surveying
- Object Number:
- 1907-74
- Materials:
- brass (copper, zinc alloy), glass, felt, mahogany (wood) and sapele (wood)
- Measurements:
-
overall: 67 mm x 130 mm x 225 mm, .51kg
- type:
- pocket sextant
- credit:
- J.C. Stevens (Auction Sales)
