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Dry compass
Card-Mica covered with paper, white with black and white markings, graduated to 1/4 points.
Needle- Single steel needle, 6.5" long, T-shaped with the vertical fin cut away at centre to accommodate the jewel cap. The centre of needle is slightly expanded.
Pivot- The jewel cap is carried in a bras stem 0.5" above face of card and the centre of the needle carries a brass disc with a small aperture through which the pivot passes to engage in the cup. Two brass arms carrying sliding weights are fitted in an E-W direction.
Needle- Single steel needle, 6.5" long, T-shaped with the vertical fin cut away at centre to accommodate the jewel cap. The centre of needle is slightly expanded.
Pivot- The jewel cap is carried in a bras stem 0.5" above face of card and the centre of the needle carries a brass disc with a small aperture through which the pivot passes to engage in the cup. Two brass arms carrying sliding weights are fitted in an E-W direction.
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Object Details
| ID: | ACO0982 |
|---|---|
| Type: | Dry compass |
| Display location: | Not on display |
| Creator: | Unknown |
| Date made: | 1844 |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 32 mm; Diameter: 185 mm |