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Dry compass
Card- Mica covered with paper, painted green with black markings, graduated to 16 points, edge of card graduated quadrantally in degrees.
Needle-Flat bar type, 5.8" (14.7cm) long, with square ends. Secured to card by two brass screws. A hole is provided at centre to accommodate pivot cap. The centre of needle is expanded slightly.
Pivot- Cone-shaped brass cap fitted with jewelled pivot at top, mounted at centre of card and screwed through hole in needle.
Needle-Flat bar type, 5.8" (14.7cm) long, with square ends. Secured to card by two brass screws. A hole is provided at centre to accommodate pivot cap. The centre of needle is expanded slightly.
Pivot- Cone-shaped brass cap fitted with jewelled pivot at top, mounted at centre of card and screwed through hole in needle.
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Object Details
| ID: | ACO0926 |
|---|---|
| Type: | Dry compass |
| Display location: | Not on display |
| Creator: | Gilbert & Sons |
| Date made: | 1840 |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 10 mm; Diameter: 155 mm |