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Circumferentor
Graduations-Circle graduated to 360 degs. Vernier scale at one end of alidade 0-60.
Sights-Two detachable sight vanes 5" (12.7cm) long mounted on circle, one sight with a vertical slit with a rectangular aperture above (threaded), the other with a rectangular aperture (threaded) with a vertical slit above. Two detachable sight vanes 4.5" (11.4cm) long, mounted on alidade, similar in description to those on circle.
Compass- Dia. 5.2" (13.1cm) mounted at centre of instrument. Fitted with a narrow tapered blued steel needle 3.75" (9.5cm) long, with a brass pivot cap at centre. Graduated to 16 points, quadrantally in degrees and anti-clockwise to 360 degs.
In wooden box 12.75 x 12.75 x 3" ( 32.4 x 32.4 x 7.6cm)
Sights-Two detachable sight vanes 5" (12.7cm) long mounted on circle, one sight with a vertical slit with a rectangular aperture above (threaded), the other with a rectangular aperture (threaded) with a vertical slit above. Two detachable sight vanes 4.5" (11.4cm) long, mounted on alidade, similar in description to those on circle.
Compass- Dia. 5.2" (13.1cm) mounted at centre of instrument. Fitted with a narrow tapered blued steel needle 3.75" (9.5cm) long, with a brass pivot cap at centre. Graduated to 16 points, quadrantally in degrees and anti-clockwise to 360 degs.
In wooden box 12.75 x 12.75 x 3" ( 32.4 x 32.4 x 7.6cm)
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Object Details
| ID: | NAV1377 |
|---|---|
| Type: | Circumferentor |
| Display location: | Not on display |
| Creator: | Wright, Thomas |
| Date made: | circa 1720 |
| Credit: | National Maritime Museum, Greenwich, London, Caird Collection |
| Measurements: | Overall: 41 mm; Diameter: 295 mm |
| Parts: | Circumferentor |