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Surveying compass
Surveying compass
Bowl: Dia. 2.9" (7.4 cm) Brass, glazed. Inside of bowl painted black. Fitted with card locking mechanism operated by knob at side of case, and a card break operated by a stud at side of bowl. Brass lid.
Sights: Fitted with a 90 deg. prism, two dark shades and a slit sight on one side, and a rectangular frame 2.25" (5.7 cm) long (with thread) and dark ground glass screen on the opposite side.
Card: Dia. 2.4" (6.1 cm) Mica covered with green paper with black markings. Graduated to 360 degrees from the South point. Brass jewelled pivot cap at centre.
Needle: Unsighted.
Pivot: Unsighted.
O.A. height 1.0" (2.6 cm)
Bowl: Dia. 2.9" (7.4 cm) Brass, glazed. Inside of bowl painted black. Fitted with card locking mechanism operated by knob at side of case, and a card break operated by a stud at side of bowl. Brass lid.
Sights: Fitted with a 90 deg. prism, two dark shades and a slit sight on one side, and a rectangular frame 2.25" (5.7 cm) long (with thread) and dark ground glass screen on the opposite side.
Card: Dia. 2.4" (6.1 cm) Mica covered with green paper with black markings. Graduated to 360 degrees from the South point. Brass jewelled pivot cap at centre.
Needle: Unsighted.
Pivot: Unsighted.
O.A. height 1.0" (2.6 cm)
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Object Details
| ID: | NAV0262 |
|---|---|
| Type: | Surveying compass |
| Display location: | Not on display |
| Creator: | Schmalcalder, Charles Augustus |
| Date made: | circa 1812 |
| Credit: | National Maritime Museum, Greenwich, London, Gabb Collection |
| Measurements: | 30 mm x 100 mm x 70 mm |
| Parts: | Surveying compass |