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Dry compass
Card-Mica covered with paper, black with white markings, graduated to 1/4 points with a decorated East point.
Needle-T-shaped with the vertical "fin" cut away at centre to accommodate jewel cap. Has an expanded centre which has a hole cut in it to take pivot cap. Length 5" (12.7cm)
Pivot- A long cone-shaped heavy brass cup fitted jewelled pivot at top, attached through hole at centre of needle. As the point of suspension is 0.75" above plane of card a small metal disc is secured to lower end of cap. This disc has a hole through which the pivot passes to cup.
Needle-T-shaped with the vertical "fin" cut away at centre to accommodate jewel cap. Has an expanded centre which has a hole cut in it to take pivot cap. Length 5" (12.7cm)
Pivot- A long cone-shaped heavy brass cup fitted jewelled pivot at top, attached through hole at centre of needle. As the point of suspension is 0.75" above plane of card a small metal disc is secured to lower end of cap. This disc has a hole through which the pivot passes to cup.
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Object details
| ID: | ACO0980 |
|---|---|
| Type: | Dry compass |
| Display location: | Not on display |
| Creator: | Unknown |
| Date made: | 1844 |
| People: | Walker, William |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 35 mm; Diameter: 120 mm |