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Dry compass
Card-Mica covered with paper, white with black markings, graduated to 1/4 points.It is perforated by eight circular holes irregularly spaced. A slot 6.5" long, 0.7" wide with expanded centre, 1.6" diameter, is cut in the N-S line of card, to accommodate the needle.
Needle- Flat bar magnet expanded at centre to accommodate pivot cap. north end marked "N". Has red paint at tip. South end marked "S" and has black paint at tip. Length 6.5" (17cm), width 0.5" (1.3cm).
Pivot- Cone-shaped brass pivot cap with large jewel at top. Held in position by brass framework.
Needle- Flat bar magnet expanded at centre to accommodate pivot cap. north end marked "N". Has red paint at tip. South end marked "S" and has black paint at tip. Length 6.5" (17cm), width 0.5" (1.3cm).
Pivot- Cone-shaped brass pivot cap with large jewel at top. Held in position by brass framework.
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Object Details
| ID: | ACO0921 |
|---|---|
| Type: | Dry compass |
| Display location: | Not on display |
| Creator: | Pope, W. L. |
| Date made: | 1820 |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 20 mm; Diameter: 175 mm |