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Admiralty Type J (heavy weather card)
Card-Dia. 7.6" (19.3cm) Mica covered with paper, blue with black and blue markings.Graduated to 1/4 points and quadrantally in degrees. Black painted brass pivot cap with speculum metal bearing at centre.
Needle-Four parallel heavy edge bar needles. Two x 7.25" (18.4cm) long, each of four laminations, 0.5" (1.3cm) deep having a semi-circular swell at centre, 1.25" (3.2cm). Two x 5" (12.7cm) long, each of two laminations 0.5" (1.3cm) deep. The pivot cap is mounted in a crossframe attached to the needles. Two brass strips are fitted in the N & S line each carries a sliding weight.
Needle-Four parallel heavy edge bar needles. Two x 7.25" (18.4cm) long, each of four laminations, 0.5" (1.3cm) deep having a semi-circular swell at centre, 1.25" (3.2cm). Two x 5" (12.7cm) long, each of two laminations 0.5" (1.3cm) deep. The pivot cap is mounted in a crossframe attached to the needles. Two brass strips are fitted in the N & S line each carries a sliding weight.
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Object Details
| ID: | NAV0377 |
|---|---|
| Type: | Compass card |
| Display location: | Not on display |
| Creator: | Unknown |
| Date made: | circa 1842 |
| Credit: | National Maritime Museum, Greenwich, London |
| Measurements: | Overall: 40 mm; Diameter: 190 mm |