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Dry compass
Card-Mica covered with paper, white with black markings, graduated to 1/2 points and has decorated East point.
Needle- Single flat bar needle 4.5" long and carries two sliding weights. Has hole at centre for pivot. A brass bar of same dimensions as needle and weights is fitted in E-W direction.
Pivot- A jewel is fitted at top of brass stem 0.5" above card and the centre of the needle carries a brass strip with a small aperture through which the pivot passes.
Needle- Single flat bar needle 4.5" long and carries two sliding weights. Has hole at centre for pivot. A brass bar of same dimensions as needle and weights is fitted in E-W direction.
Pivot- A jewel is fitted at top of brass stem 0.5" above card and the centre of the needle carries a brass strip with a small aperture through which the pivot passes.
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Object Details
| ID: | ACO0957 |
|---|---|
| Type: | Dry compass |
| Display location: | Not on display |
| Creator: | Preston, Grant |
| Date made: | 1837-1840; 1837-40 |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 20 mm; Diameter: 110 mm |