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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 bar edge needles, composed of two laminations of rolled clock spring steel, 2 x 8.75" and 2 x 7" long and 0.4" deep.Two inner needles 3.25" apart , the two outer 1.25" from inner ones. Mounted on a metal ring 9.4" dia.which is screwed to the card.
Pivot- Heavy cone-shaped brass pivot cap with white metal bearing at top, screwed through centre plate of framework having four long arms, carrying sliding weights, attached to the metal mounting ring.
Needle- Four bar edge needles, composed of two laminations of rolled clock spring steel, 2 x 8.75" and 2 x 7" long and 0.4" deep.Two inner needles 3.25" apart , the two outer 1.25" from inner ones. Mounted on a metal ring 9.4" dia.which is screwed to the card.
Pivot- Heavy cone-shaped brass pivot cap with white metal bearing at top, screwed through centre plate of framework having four long arms, carrying sliding weights, attached to the metal mounting ring.
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Object Details
| ID: | ACO0967 |
|---|---|
| Type: | Compass card |
| Display location: | Not on display |
| Creator: | Unknown |
| Vessels: | Penguin fl.1807 |
| Date made: | 1837-1840; 1837-40 |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 20 mm; Diameter: 233 mm |