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Dry card compass
Bowl-Painted brass. Glazed. Has two spirit levels set in base. Front and back sights with tripod holder at base.
Card-Mica. Comprising thin circular strip with graduated green paper and two semi-circular arcs. The rest is hollow. Graduations in degrees to 360. Jewelled pivot cap at centre.
Sights-Front is hollow arch with wire and adjustable glazed frame. Operates stop mechanism when closed down. Back is fixed prism with peephole and slit.
Tripod-Brass. Has four levelling screws set between two platforms. Length 7" (17.9cm).
It ismarked with Hyrographic number, H44. The sextant was sent to Richard Owen in the Caribbean in 1831.
Card-Mica. Comprising thin circular strip with graduated green paper and two semi-circular arcs. The rest is hollow. Graduations in degrees to 360. Jewelled pivot cap at centre.
Sights-Front is hollow arch with wire and adjustable glazed frame. Operates stop mechanism when closed down. Back is fixed prism with peephole and slit.
Tripod-Brass. Has four levelling screws set between two platforms. Length 7" (17.9cm).
It ismarked with Hyrographic number, H44. The sextant was sent to Richard Owen in the Caribbean in 1831.
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Object Details
| ID: | ACO0099 |
|---|---|
| Type: | Dry card compass |
| Display location: | Not on display |
| Creator: | Unknown |
| Date made: | 1840-1850; 1840-50 |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 225 mm x 150 mm x 135 mm |