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Compass card
Card-Mica covered with paper, blue 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" long and 0.5" deep.Mounted 2" 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 of light metal framework which has two short arms secured to the two inner needles and two long arms, carrying sliding weights, attached 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" long and 0.5" deep.Mounted 2" 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 of light metal framework which has two short arms secured to the two inner needles and two long arms, carrying sliding weights, attached to the metal ring of card.
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Object Details
| ID: | ACO0965 |
|---|---|
| Type: | Compass card |
| Display location: | Not on display |
| Creator: | Unknown |
| Date made: | 1840 |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 20 mm; Diameter: 190 mm |