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Dry card compass
Bowl-Brass with copper lining set in brass gimbals. Weighted at base. Black lubber line painted on inside of bowl. Glass has pivot location stud.
Card-Mica covered with paper. Black with white markings graduated to 32 points. Jewelled brass pivot cap. Dia. 4" (10.1cm)
Needle-Four edge bar magnets attached to brass ring secured to underside of card. Lengths 2 x 3.75" (9.5cm), 2 x 2.5" (6.4cm).
Pivot-Steel tipped brass needle set in brass mount attached to base of bowl.
Card-Mica covered with paper. Black with white markings graduated to 32 points. Jewelled brass pivot cap. Dia. 4" (10.1cm)
Needle-Four edge bar magnets attached to brass ring secured to underside of card. Lengths 2 x 3.75" (9.5cm), 2 x 2.5" (6.4cm).
Pivot-Steel tipped brass needle set in brass mount attached to base of bowl.
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Object Details
| ID: | ACO0017 |
|---|---|
| Type: | Dry card compass |
| Display location: | Not on display |
| Creator: | Gilbert, W. |
| Date made: | circa 1839 |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 100 mm x 175 mm x 175 mm |