Dry card compass
Bowl: Brass painted black. Glazed has brass cover. Front and back sights.
Card: Mica covered with paper. Green on top blue underneath. Green with black markings graduated to four cardinal points and to 130 degrees. Wax balancing blob on underside. Diameter 2.5" (6.4 cm)
Needle: Elongated diamond attached to card by two brass studs. Length 2.1" (6.4 cm)
Pivot stud: Brass and jewelled
Pivot: Brass spike with card stop attached. Card stop radial arm connected to front sight.
Sights: Front: Open arch with wire, hinged, operates card stop when folded own. Can be folded down beneath brass cover. Manual card stop button attached to hinge. Back: Hinged prismatic with eye hole and slit.
O.A. Height 3.25" (8.1 cm)
Card: Mica covered with paper. Green on top blue underneath. Green with black markings graduated to four cardinal points and to 130 degrees. Wax balancing blob on underside. Diameter 2.5" (6.4 cm)
Needle: Elongated diamond attached to card by two brass studs. Length 2.1" (6.4 cm)
Pivot stud: Brass and jewelled
Pivot: Brass spike with card stop attached. Card stop radial arm connected to front sight.
Sights: Front: Open arch with wire, hinged, operates card stop when folded own. Can be folded down beneath brass cover. Manual card stop button attached to hinge. Back: Hinged prismatic with eye hole and slit.
O.A. Height 3.25" (8.1 cm)
Object Details
| ID: | ACO0112 |
|---|---|
| Type: | Dry card compass |
| Display location: | Not on display |
| Creator: | Dover, John |
| Date made: | circa 1850 |
| People: | Royal Navy |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 75 mm; Diameter: 80 mm |
| Parts: | Dry card compass |