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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. Fitted with a brass rim, graduated to 20' of arc.
Needle- Flat bar type, 6.25" (15.9cm) long, with pointed ends and is fitted with two soft iron sliding weights. Each end of needle rests on semi-circular strip of brass, securing needle to card. a hole is provided at centre to accommodate pivot cap.
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, 6.25" (15.9cm) long, with pointed ends and is fitted with two soft iron sliding weights. Each end of needle rests on semi-circular strip of brass, securing needle to card. a hole is provided at centre to accommodate pivot cap.
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: | ACO0925 |
|---|---|
| Type: | Dry compass |
| Display location: | Not on display |
| Creator: | Gilbert & Sons |
| Date made: | circa 1840 |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 15 mm; Diameter: 158 mm |