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Dry card compass
Recess: Ringed with brass graduated rim. Graduated quadrantally in degrees. Fitted with needle lifter. Perspex in place of glass.
Card: Mica covered with paper. Black with white markings graduated to points and quadrantally in degrees. Decorated North and East points. Diameter 6.5" (16.5 cm)
Needle: Narrow flat bar type with raised brass tips with pointers at each end. Pierced at centre to accommodate jewelled pivot cap. Length 9" (22.9.cm)
Pivot: Steel pin direct from base of recess.
Azimuth sights: Two brass foldable vanes mounted at North and South points incorporating alternate open and closed sights, threads missing.
Mounted in own stand.
Dims. 12" square (30.5 cm)
O.A. Height: 6.75" (17.2 cm)
Card: Mica covered with paper. Black with white markings graduated to points and quadrantally in degrees. Decorated North and East points. Diameter 6.5" (16.5 cm)
Needle: Narrow flat bar type with raised brass tips with pointers at each end. Pierced at centre to accommodate jewelled pivot cap. Length 9" (22.9.cm)
Pivot: Steel pin direct from base of recess.
Azimuth sights: Two brass foldable vanes mounted at North and South points incorporating alternate open and closed sights, threads missing.
Mounted in own stand.
Dims. 12" square (30.5 cm)
O.A. Height: 6.75" (17.2 cm)
For more information about using images from our Collection, please contact RMG Images.
Object Details
| ID: | ACO0113 |
|---|---|
| Type: | Dry card compass |
| Display location: | Not on display |
| Creator: | Unknown |
| Date made: | circa 1795 |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 30 mm x 302 mm x 310 mm |