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Compass card
Card-Mica covered with paper, blue with black and blue markings, graduated to 1/4 points, about 1" from edge is a circle of degree graduations with two rows of figures 0-90 quadrantally and 0-360.
Needle- Four light bar edge needles, composed of two laminations of steel, 2 x 7.4" and 2 x 5,25" long and 0.5" deep. Mounted 2" apart, attached to two parallel metal strips 3.25" apart which are screwed to card.
Pivot- Cone-shaped brass pivot cap with jewel at top, screwed through centre of metal strip which is secured to the two parallel strips on which the needles are mounted.
Needle- Four light bar edge needles, composed of two laminations of steel, 2 x 7.4" and 2 x 5,25" long and 0.5" deep. Mounted 2" apart, attached to two parallel metal strips 3.25" apart which are screwed to card.
Pivot- Cone-shaped brass pivot cap with jewel at top, screwed through centre of metal strip which is secured to the two parallel strips on which the needles are mounted.
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Object Details
| ID: | ACO0975 |
|---|---|
| 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: 192 mm |
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