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Dry compass
Dry compass
Card: Mica covered with paper, white with black markings, graduated to half points and quadrantally in degrees with a decorated East point. Card has a 1.5" hole at the centre to accommodate the pivot arrangement.
Needle: Two 5.75" (14.6 cm) edge bar needles, attached to the card by light brass struts.
Pivot: The central aperture in the card carries a brass ring in which a bell-shaped weight, which carries the jewel cap at its apex, is supported in substantial brass double gimbals.
Card: Mica covered with paper, white with black markings, graduated to half points and quadrantally in degrees with a decorated East point. Card has a 1.5" hole at the centre to accommodate the pivot arrangement.
Needle: Two 5.75" (14.6 cm) edge bar needles, attached to the card by light brass struts.
Pivot: The central aperture in the card carries a brass ring in which a bell-shaped weight, which carries the jewel cap at its apex, is supported in substantial brass double gimbals.
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Object Details
| ID: | ACO1018 |
|---|---|
| Type: | Dry compass |
| Display location: | Not on display |
| Creator: | Unknown |
| Date made: | circa 1850 |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 50 mm; Diameter: 180 mm |