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Compass card
Dry compass.
Card: Mica covered with paper, white with black markings, graduated to 1/4 points and quadrantally in degrees. N point indicated by a five-pointed star. Fitted with a course indicating pointer 8.6" (22.0 cm) long which can be clamped in any required position by means of a boss which carries the jewel cup.
Needle: Two edge bar needles 9.8" (25.0 cm) long with round ends are attached to the card by means of a light brass framework.
Pivot: Cone shaped brass pivot cup with red jewel at the top secured at the centre of centre strut of framework which secures the needles to the card.
Card: Mica covered with paper, white with black markings, graduated to 1/4 points and quadrantally in degrees. N point indicated by a five-pointed star. Fitted with a course indicating pointer 8.6" (22.0 cm) long which can be clamped in any required position by means of a boss which carries the jewel cup.
Needle: Two edge bar needles 9.8" (25.0 cm) long with round ends are attached to the card by means of a light brass framework.
Pivot: Cone shaped brass pivot cup with red jewel at the top secured at the centre of centre strut of framework which secures the needles to the card.
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Object Details
| ID: | ACO0871 |
|---|---|
| Type: | Compass card |
| Display location: | Not on display |
| Creator: | Malacrida, Emmanuel |
| Date made: | circa 1850 |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 30 mm; Diameter: 297 mm |