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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 degs.
Needle- One solid edge bar needle, 7.65" long having a heavy centre boss with an aperture, 1.15" dia. in which the pivot cap is mounted. Two brass strips carrying sliding weights are fitted in E-W direction. The whole is mounted on a light metal ring screwed to card.
Pivot- Heavy cone-shaped brass pivot cap mounted in central aperture in double gimbals and attached to needle by two brass knee pieces.
Needle- One solid edge bar needle, 7.65" long having a heavy centre boss with an aperture, 1.15" dia. in which the pivot cap is mounted. Two brass strips carrying sliding weights are fitted in E-W direction. The whole is mounted on a light metal ring screwed to card.
Pivot- Heavy cone-shaped brass pivot cap mounted in central aperture in double gimbals and attached to needle by two brass knee pieces.
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Object Details
| ID: | ACO0949 |
|---|---|
| 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: 32 mm; Diameter: 195 mm |