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Dry compass
Bowl- Brass with white metal bottom. Engraved to eight points and quadrantally in degrees on inner scale and to 360 degs on outer scale. Heavy floral engraving on 4 cardinal points. Glazed. Brass cover.
Needle- Arow-shaped with brass pivot at centre. Length 3.0" (7.6cm0
Pivot- Steel spike
Arc- Semi-circle with two rows of graduations. Two moveable arms which are attached to compass bowl; each have a vernier. Diameter of arc at limit 8.5" (21.6cm)
O.A. Height 2.6cm
Needle- Arow-shaped with brass pivot at centre. Length 3.0" (7.6cm0
Pivot- Steel spike
Arc- Semi-circle with two rows of graduations. Two moveable arms which are attached to compass bowl; each have a vernier. Diameter of arc at limit 8.5" (21.6cm)
O.A. Height 2.6cm
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Object Details
| ID: | ACO0420 |
|---|---|
| Type: | Dry compass |
| Display location: | Not on display |
| Creator: | Heath, Thomas |
| Date made: | circa 1720 |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 25 mm x 215 mm x 195 mm |
| Parts: | Dry compass |