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Dry card compass
Bowl-Copper with top and bottom brass verge rings. Verge glass at top and bottom and suspended in ACO stand. Lead ring on inside of bowl. Black pencilled lubber lines.
Card-Silk, stretched on copper hoops. Black with white markings graduated to 1/4 points. Decorated North and East points. Brass gimballed pivot cap at centre. Dia. 9.5" (24.2cm)
Needle-Edge bar type, holed at centre to accommodate pivot cap. Has brass balancing weights on arms. Two brass cross struts also with brass balance weights. Length, 9.5" (24.2cm)
Pivot-Ruby tipped brass spike on screw in mounting secured to brass base of bowl. Fits into gimballed bell-shaped pivot cap.
ACO stand 11.5 (29.2cm) square, O.A.Height 6.5" (16.5cm)
Card-Silk, stretched on copper hoops. Black with white markings graduated to 1/4 points. Decorated North and East points. Brass gimballed pivot cap at centre. Dia. 9.5" (24.2cm)
Needle-Edge bar type, holed at centre to accommodate pivot cap. Has brass balancing weights on arms. Two brass cross struts also with brass balance weights. Length, 9.5" (24.2cm)
Pivot-Ruby tipped brass spike on screw in mounting secured to brass base of bowl. Fits into gimballed bell-shaped pivot cap.
ACO stand 11.5 (29.2cm) square, O.A.Height 6.5" (16.5cm)
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Object Details
| ID: | ACO0021 |
|---|---|
| Type: | Dry card compass |
| Display location: | Not on display |
| Creator: | West & Co |
| Date made: | 1850 |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 113 mm x 290 mm x 250 mm;Weight: 4.9 kg |
| Parts: | Dry card compass |