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Dry card compass
Bowl-Copper, glazed. Inside of bowl painted white with a black painted lubber line on side. A lead balancing weight is secured in base, through the centre of which a brass pivot stem is secured. Mounted in abrass gimbal ring. Dia. 7" (17.8cm)
Card-Dia. 5.3" (13.5cm) Mica covered with paper, centre black with white markings, outer rim white with black markings. Graduated quadrantally in degrees and to 32 points with a decorated West point.
Needle-Flat bar type 5" (12.7cm) long with round ends and expanded centre to accommodate pivot cup is attached to underside of card.
Pivot-Brass pivot stem 1.5" (3.8cm) long attached to base of bowl. A conical brass jewelled pivot cup is secured at centre of card and expanded centre of needle.
Card-Dia. 5.3" (13.5cm) Mica covered with paper, centre black with white markings, outer rim white with black markings. Graduated quadrantally in degrees and to 32 points with a decorated West point.
Needle-Flat bar type 5" (12.7cm) long with round ends and expanded centre to accommodate pivot cup is attached to underside of card.
Pivot-Brass pivot stem 1.5" (3.8cm) long attached to base of bowl. A conical brass jewelled pivot cup is secured at centre of card and expanded centre of needle.
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Object Details
| ID: | NAV0485 |
|---|---|
| Type: | Dry card compass |
| Display location: | Not on display |
| Creator: | Whyte & Co |
| Date made: | 1875-1877; 1875-7 |
| Credit: | National Maritime Museum, Greenwich, London |
| Measurements: | Overall: 120 mm; Diameter: 180 mm |
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