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Dry compass
Dry compass
Card: Mica with markings painted onto it. Grey with black markings graduated to half points and 0 - 360 degrees. Open at centre to accommodate angled iron bridge which holds pivot spike.
Needle: two edge bar needles attached to card support framework. Both needles have moveable weights attached. Length 10" (25.5 cm)
Pivot: The bridge is attached to a central ring by screws and leaf springs. The pivot spike screws into the bridge.
Card: Mica with markings painted onto it. Grey with black markings graduated to half points and 0 - 360 degrees. Open at centre to accommodate angled iron bridge which holds pivot spike.
Needle: two edge bar needles attached to card support framework. Both needles have moveable weights attached. Length 10" (25.5 cm)
Pivot: The bridge is attached to a central ring by screws and leaf springs. The pivot spike screws into the bridge.
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Object Details
| ID: | ACO1009 |
|---|---|
| Type: | Dry compass |
| Display location: | Not on display |
| Creator: | Gray |
| Date made: | 1860 |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 37 mm; Diameter: 260 mm |