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Dry card compass
Bowl-Brass with weight at bottom for stability. Lubber line is marked black on a strip of bone or ivory. Set in double brass gimbals and glass held in place by brass verge ring. Brass pivot locating stud at centre.
Card-Mica, covered with paper. Black card, markings in white graduated to 1/4 points. Decorated North and East points. Pivot arrangement at centre of card. Wax balancing blobs on underside of card.
Needle-Four edge bar needles supported by brass cross struts. Lengths 2 x 6.25" (15.6cm), 2 x 3.75" (9.5cm)
Pivot-Steel spike set in double brass gimbals secured to card. Pivot rests on brass stem holding jewelled cup set in double brass gimbals. Stem secured to base by screw.
Card-Mica, covered with paper. Black card, markings in white graduated to 1/4 points. Decorated North and East points. Pivot arrangement at centre of card. Wax balancing blobs on underside of card.
Needle-Four edge bar needles supported by brass cross struts. Lengths 2 x 6.25" (15.6cm), 2 x 3.75" (9.5cm)
Pivot-Steel spike set in double brass gimbals secured to card. Pivot rests on brass stem holding jewelled cup set in double brass gimbals. Stem secured to base by screw.
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Object Details
| ID: | ACO0013 |
|---|---|
| Type: | Dry card compass |
| Display location: | Not on display |
| Creator: | Owen, E. |
| Date made: | circa 1840 |
| People: | Alexander, George; Knight, Gowin |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 140 mm x 310 mm x 270 mm |