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Compass card
Card-Mica covered with paper, blue with black and blue 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" and 2 x 5" 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 white metal bearing at top, screwed through centre of light metal cross piece which is secured to the two inner needles.
Needle- Four light bar edge needles, composed of two laminations of rolled clock spring steel, 2 x 7" and 2 x 5" 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 white metal bearing at top, screwed through centre of light metal cross piece which is secured to the two inner needles.
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Object Details
| ID: | ACO0964 |
|---|---|
| Type: | Compass card |
| Display location: | Not on display |
| Creator: | Unknown |
| Date made: | 1840 |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 25 mm; Diameter: 192 mm |