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Dry compass
Card- Mica covered with paper. White with black and white markings, graduated to 1/4 and graduated quadrantally in degrees.
Needle- Single light edge bar type 7.7" length, with flattened expanded centre into which pivot cap is screwed. Fitted with two sliding balancing weights. Mounted on a light metal ring which is attached to card by screws.
Pivot- Cone-shaped brass pivot cap with jewel at top screwed through centre of needle.
Needle- Single light edge bar type 7.7" length, with flattened expanded centre into which pivot cap is screwed. Fitted with two sliding balancing weights. Mounted on a light metal ring which is attached to card by screws.
Pivot- Cone-shaped brass pivot cap with jewel at top screwed through centre of needle.
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Object details
| ID: | ACO0938 |
|---|---|
| Type: | Dry compass |
| Display location: | Not on display |
| Creator: | Robinson, Thomas Charles; Robinson |
| Date made: | 1837-1840; 1837-40 |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 15 mm; Diameter: 190 mm |