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Compass card
Dry compass
Card: Mica covered with paper, white with black markings, graduated quadrantally in degrees and 1/2 points. N point marked by a five pointed star.
Needle: Single flat bar needle with pointed ends and expanded centre through which the pivot is secured. Brass balancing weights are attached at the E & W points.
Pivot: Double pivot type. Consists of a long steel spindle with pivot points at both ends and which is attached at centre of needle by a brass collar.
Card: Mica covered with paper, white with black markings, graduated quadrantally in degrees and 1/2 points. N point marked by a five pointed star.
Needle: Single flat bar needle with pointed ends and expanded centre through which the pivot is secured. Brass balancing weights are attached at the E & W points.
Pivot: Double pivot type. Consists of a long steel spindle with pivot points at both ends and which is attached at centre of needle by a brass collar.
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Object Details
| ID: | ACO0870 |
|---|---|
| Type: | Compass card |
| Display location: | Not on display |
| Creator: | Unknown |
| Date made: | circa 1825 |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 67 mm; Diameter: 140 mm |