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Compass card
Dry compass
Card: Mica covered with paper, white with black markings. It is a double card with the outer rim graduated quadrantally in degrees. The inner moveable portion is graduated to half points with decorated N & E points, and is turned by a brass collar at the centre of the card to allow for the variation and show the true course, while the outer rim shows magnetic.
Needle: 7.9" (20.0 cm) long, flat bar needle painted red, with square ends and a slightly expanded centre.
Pivot: Conical brass pivot cup, with jewel at the top, screwed through the centre of the needle and brass card-turning collar at the centre of the card.
Card: Mica covered with paper, white with black markings. It is a double card with the outer rim graduated quadrantally in degrees. The inner moveable portion is graduated to half points with decorated N & E points, and is turned by a brass collar at the centre of the card to allow for the variation and show the true course, while the outer rim shows magnetic.
Needle: 7.9" (20.0 cm) long, flat bar needle painted red, with square ends and a slightly expanded centre.
Pivot: Conical brass pivot cup, with jewel at the top, screwed through the centre of the needle and brass card-turning collar at the centre of the card.
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Object Details
| ID: | ACO0882 |
|---|---|
| Type: | Compass card |
| Display location: | Not on display |
| Creator: | Boosman, W. |
| Date made: | circa 1870 |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 20 mm; Diameter: 200 mm |