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cross, surveyor's
Cross-tubular body, adjustable base graduated to 360 degrees and fitted with verier scale 0-60. Bottom has a screw which rotates the instrument in azimuth about its base.
Sights-Four vertical slit sights are cut in to tubular body.
Compass-Dia. 3" (7.6cm) set in top of instrument. Fitted wih an edge bar bar needle 2.25" (5.8cm) long, with a jewelled pivot cap at centre. A needle lifting mechanism is fitted and is operated by a stud in rim of bowl. Graduated to 8 points, quadrantally in degrees and anti-clockwise to 360 degs. Fitted with a brass lid.
Sights-Four vertical slit sights are cut in to tubular body.
Compass-Dia. 3" (7.6cm) set in top of instrument. Fitted wih an edge bar bar needle 2.25" (5.8cm) long, with a jewelled pivot cap at centre. A needle lifting mechanism is fitted and is operated by a stud in rim of bowl. Graduated to 8 points, quadrantally in degrees and anti-clockwise to 360 degs. Fitted with a brass lid.
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Object details
| ID: | NAV1388 |
|---|---|
| Type: | cross, surveyor's |
| Display location: | Not on display |
| Creator: | W. & S. Jones |
| Date made: | circa 1830 |
| Credit: | National Maritime Museum, Greenwich, London |
| Measurements: | Overall: 98 mm x 80 mm x 72 mm |