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Compass card
Dry compass
Card: Mica covered with paper, white with black markings, N point indicated by a five-pointed star, graduated quadrantally in degrees and to 1/2 points. At centre of card is a hole 0.5" (1.3 cm) dia to accommodate pivot cup. Brass balancing weights secured at E & W points.
Needle: A single flat bar needle 5.5" (14.0 cm) long with pointed ends and expanded centre.
Pivot: Cone shaped brass pivot cup with jewel at top secured through centre of needle.
Card: Mica covered with paper, white with black markings, N point indicated by a five-pointed star, graduated quadrantally in degrees and to 1/2 points. At centre of card is a hole 0.5" (1.3 cm) dia to accommodate pivot cup. Brass balancing weights secured at E & W points.
Needle: A single flat bar needle 5.5" (14.0 cm) long with pointed ends and expanded centre.
Pivot: Cone shaped brass pivot cup with jewel at top secured through centre of needle.
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Object Details
| ID: | ACO0869 |
|---|---|
| Type: | Compass card |
| Display location: | Not on display |
| Creator: | Froment |
| Date made: | circa 1825 |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 15 mm; Diameter: 140 mm |
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