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Dry compass
Dry compass
Card: Mica covered with paper, black with white markings, graduated to quarter points.
Needle: One flat bar needle 6.6" long, having rounded ends and an expanded centre, to accommodate pivot cup, fitted with brass sliding weights. A brass cross bar is fitted having an expanded centre plate, fitted above expanded centre of needle, carrying sliding weights.
Pivot: Cone shaped brass pivot cup with jewel at top screwed through centre of needle.
Card: Mica covered with paper, black with white markings, graduated to quarter points.
Needle: One flat bar needle 6.6" long, having rounded ends and an expanded centre, to accommodate pivot cup, fitted with brass sliding weights. A brass cross bar is fitted having an expanded centre plate, fitted above expanded centre of needle, carrying sliding weights.
Pivot: Cone shaped brass pivot cup with jewel at top screwed through centre of needle.
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Object Details
| ID: | ACO1035 |
|---|---|
| Type: | Dry compass |
| Display location: | Not on display |
| Creator: | Dent, Edward John |
| Date made: | circa 1850 |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 10 mm; Diameter: 167 mm |