Box for brass framed pocket sextant.
Box for pocket sextant made by John Dollond, London, about 1800.
- Object Number:
- 1952-195/1
- type:
- pocket sextant
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LicensePocket sextant made by John Dollond, London, about 1800
Science Museum Group
© The Board of Trustees of the Science Museum
Brass framed pocket sextant
Science Museum Group Collection
© 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. 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.
Details
- Category:
- Navigation
- Object Number:
- 1952-195
- Materials:
- brass (copper, zinc alloy), wood (unidentified), silver (metal), glass and mirror-glass (silvered)
- Measurements:
-
overall: 180 mm x 105 mm x 70 mm, .26kg
- type:
- pocket sextant
- credit:
- J H Steward Limited
Parts
