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Dry compass
Card-Mica covered with paper, black with white and black markings, graduated to 1/4 points and quadrantally in degrees. Card has 2" dia. hole at centre fitted with rubber disc in which pivot cap is set.
Needle-Four edge bar needles, 2 x 7.15". 2 x 5.25" in length, attached to card by a brass ring. A brass strut with two balance weights is fitted across the diameter of ring.
Pivot- The central aperture in card carries a brass ring in which is fitted a rubber disc at the centre of which is set a cone-shaped jewel cap.
Needle-Four edge bar needles, 2 x 7.15". 2 x 5.25" in length, attached to card by a brass ring. A brass strut with two balance weights is fitted across the diameter of ring.
Pivot- The central aperture in card carries a brass ring in which is fitted a rubber disc at the centre of which is set a cone-shaped jewel cap.
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Object details
| ID: | ACO0985 |
|---|---|
| Type: | Dry compass |
| Display location: | Not on display |
| Creator: | Unknown |
| Date made: | circa 1860 |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 20 mm; Diameter: 190 mm |