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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- Two light bar edge needles, 5.5" (14cm) long and 0.4"(1.3cm) deep. Mounted on two light parallel bars 4.75" (12cm) apart and screwed to the card.
Pivot- Small cone-shaped brass pivot cap with jewel at top, screwed through centre plate of light brass framework consisting of four long arms radiating from centre plate, the two E-W arms are attached to the two needles, the N-S arms are attached to the bars on which the needles are mounted.
In fitted wooden box 7.5 x 7.5 x 2" (19 x 19 x 5.1cm) containing a small boxwood container 1.25" (3.2cm) dia. containing one spare pivot cap and two pivot points.
Needle- Two light bar edge needles, 5.5" (14cm) long and 0.4"(1.3cm) deep. Mounted on two light parallel bars 4.75" (12cm) apart and screwed to the card.
Pivot- Small cone-shaped brass pivot cap with jewel at top, screwed through centre plate of light brass framework consisting of four long arms radiating from centre plate, the two E-W arms are attached to the two needles, the N-S arms are attached to the bars on which the needles are mounted.
In fitted wooden box 7.5 x 7.5 x 2" (19 x 19 x 5.1cm) containing a small boxwood container 1.25" (3.2cm) dia. containing one spare pivot cap and two pivot points.
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Object Details
| ID: | ACO0972 |
|---|---|
| Type: | Compass card |
| Display location: | Not on display |
| Creator: | Dover, A. W. |
| Date made: | 1837-1840; 1837-40 |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 47 mm x 190 mm x 194 mm; Diameter: 168 mm |