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Compass card
Card-Mica covered with paper, white with black markings, graduated to 1/4 points and quadrantally in degrees.
Needle- One heavy flat bar needle 6.5" long, with expanded centre to accommodate pivot, fitted with two brass sliding weights. A brass bar 6.5" long is fitted E-W, also with expanded centre and brass sliding weights. All attached to a metal ring 6" dia. which is screwed to card.
Pivot- Cone-shaped pivot cap, with jewel at top screwed through centre of needle. A heavy brass bell-shaped weight 1.6" deep is attached to needle below pivot, on a collar secured to needle by brass knee pieces. The weight is screwed onto the collar.
Needle- One heavy flat bar needle 6.5" long, with expanded centre to accommodate pivot, fitted with two brass sliding weights. A brass bar 6.5" long is fitted E-W, also with expanded centre and brass sliding weights. All attached to a metal ring 6" dia. which is screwed to card.
Pivot- Cone-shaped pivot cap, with jewel at top screwed through centre of needle. A heavy brass bell-shaped weight 1.6" deep is attached to needle below pivot, on a collar secured to needle by brass knee pieces. The weight is screwed onto the collar.
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Object details
| ID: | ACO0961 |
|---|---|
| Type: | Compass card |
| Display location: | Not on display |
| Creator: | Unknown |
| Date made: | 1837-1840; 1837-40 |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 40 mm; Diameter: 165 mm |