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Compass card
Card-Mica covered with paper, white with black and white markings, graduated to 1/4 points and quadrantally in degrees.
Needle- Four light bar edge needles, composed of two laminations of rolled clock spring steel, 2 x 7.25" and 2 x 5.25" long and 0.5" deep.Mounted 1.75" apart ,all attached to a light metal ring which is screwed to the card.
Pivot- Cone-shaped brass pivot cap with jewel at top, screwed through centre plate of light brass framework consisting of four long bars radiating from centre, each carrying sliding weights, secured to the metal ring of card.
Needle- Four light bar edge needles, composed of two laminations of rolled clock spring steel, 2 x 7.25" and 2 x 5.25" long and 0.5" deep.Mounted 1.75" apart ,all attached to a light metal ring which is screwed to the card.
Pivot- Cone-shaped brass pivot cap with jewel at top, screwed through centre plate of light brass framework consisting of four long bars radiating from centre, each carrying sliding weights, secured to the metal ring of card.
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Object Details
| ID: | ACO0962 |
|---|---|
| Type: | Compass card |
| Display location: | Not on display |
| Creator: | Unknown |
| Date made: | 1840 |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 23 mm; Diameter: 190 mm |