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Dip circle
Dip circle, inscribed 'Dollond London'. It comprises a six-inch steel needle that rotates in a vertical plane against a circular silvered scale marked from 0 to 90 degrees (to 20 minutes) in each quadrant, with 0 at the horizontal. Two spirit levels are attached to the top of the instrument, with a locking mechanism operated from one side. The lid of the fitted wooden box forms a stand with three levelling feet. When fitted into the lid for use, the circle can be rotated and has a direction indicator piece with an arrow inscribed on it. The lid has a circular grid lightly inscribed on it. The box also contains a brass compass and spare needle. A further piece is now missing.
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Object Details
| ID: | NAV0699 |
|---|---|
| Type: | Dip circle |
| Display location: | Display - Polar Worlds Gallery |
| Creator: | Dollond & Aitchison |
| Events: | Arctic Exploration: Buchan's voyage, 1818; Arctic Exploration: Parry's second voyage, 1821-1823 |
| Date made: | circa 1817 |
| Exhibition: | North-West Passage |
| Credit: | National Maritime Museum, Greenwich, London, Rev. George Fisher Collection |
| Measurements: | 303 mm (max height); Box: 283 x 235 x 98 mm; circle diameter 191 mm |
| Parts: | Dip circle |
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