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Dry compass
Card- Made up of several thick layers of mica covered with paper. White with black markings, graduated to 32 points with a decorated East point, edge of card graduated quadrantally in degrees.
Needle- An elongated diamond, 6.252 (15.9cm) with an aperture at centre to accommodate the pivot cap. On either side of aperture, the metal of needle is cut away.
Pivot- Cone-shaped heavy brass cap fitted with jewelled pivot at top, mounted in double brass gimbals and attached to needle by two brass brackets.
Needle- An elongated diamond, 6.252 (15.9cm) with an aperture at centre to accommodate the pivot cap. On either side of aperture, the metal of needle is cut away.
Pivot- Cone-shaped heavy brass cap fitted with jewelled pivot at top, mounted in double brass gimbals and attached to needle by two brass brackets.
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Object Details
| ID: | ACO0930 |
|---|---|
| Type: | Dry compass |
| Display location: | Not on display |
| Creator: | Hewitson, J. |
| Date made: | circa 1830 |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 15 mm; Diameter: 155 mm |