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Dry compass
Card- Mica covered with paper. White with black and white markings, graduated to 1/4 points and quadrantally in degrees.
Needle- One solid edge bar type, 7.7" long, having a heavy centre boss which carries the pivot cap. Fitted with two sliding weights, two brass strips carrying sliding weights are fitted in E-W direction. The needle is mounted on a light metal ring which is screwed to card.
Pivot- Small cone-shaped brass pivot cap with jewel at top, attached to centre boss of needle.
Needle- One solid edge bar type, 7.7" long, having a heavy centre boss which carries the pivot cap. Fitted with two sliding weights, two brass strips carrying sliding weights are fitted in E-W direction. The needle is mounted on a light metal ring which is screwed to card.
Pivot- Small cone-shaped brass pivot cap with jewel at top, attached to centre boss of needle.
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Object details
| ID: | ACO0945 |
|---|---|
| Type: | Dry compass |
| Display location: | Not on display |
| Creator: | Henry Barrow & Co |
| Date made: | 1837-1840; 1837-40 |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 20 mm; Diameter: 190 mm |