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Surveying compass
Combined Surveyor's Compass, Level and Inclinometer
Bowl-Dia. 3" (7.6cm) mounted at centre of wooden box and fitted with brass verge ring and a brass stud operating a card lifting mechanism.
Card-Dia. 2.75" (7cm) paper covered mica (?). White with black markings, graduated quadrantally in degrees. Fitted with a brass jewelled pivot cap at centre. At centre of card is a table of tangents.
Sights-Two brass sight vanes are mounted on base of box, one vane with a peep-hole sight and the other with a hole and cross wires.
Spirit level-Length 1.5" (3.8cm) mounted in right hand side of base of box.
Inclinometer-Brass quadrant 2.75" (7cm) radius graduated to 90 degs by 1o and fitted with a brass index arm 2.3" (6cm) long. Mounted in lid of box.
Bowl-Dia. 3" (7.6cm) mounted at centre of wooden box and fitted with brass verge ring and a brass stud operating a card lifting mechanism.
Card-Dia. 2.75" (7cm) paper covered mica (?). White with black markings, graduated quadrantally in degrees. Fitted with a brass jewelled pivot cap at centre. At centre of card is a table of tangents.
Sights-Two brass sight vanes are mounted on base of box, one vane with a peep-hole sight and the other with a hole and cross wires.
Spirit level-Length 1.5" (3.8cm) mounted in right hand side of base of box.
Inclinometer-Brass quadrant 2.75" (7cm) radius graduated to 90 degs by 1o and fitted with a brass index arm 2.3" (6cm) long. Mounted in lid of box.
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Object Details
| ID: | NAV0496 |
|---|---|
| Type: | Surveying compass |
| Display location: | Not on display |
| Creator: | Cary |
| Date made: | circa 1810 |
| Credit: | National Maritime Museum, Greenwich, London |
| Measurements: | Overall: 30 mm x 90 mm x 80 mm |