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Dry compass
Dry compass
Card: Mica covered with paper, black with white markings, graduated to quarter points.
Needle: Two heavy edge bar needles 4.35" (11.1 cm) in length, attached to card by a brass ring.
Pivot: Double pivot type, upper pivot secured to centre of card by a brass boss and is fitted with a spider of four brass arms, fitted with weights for balancing which radiate from central boss. Lower pivot secured to centre of card by a heavy brass boss which has two struts linking the two edge bar needles with the pivot.
Card: Mica covered with paper, black with white markings, graduated to quarter points.
Needle: Two heavy edge bar needles 4.35" (11.1 cm) in length, attached to card by a brass ring.
Pivot: Double pivot type, upper pivot secured to centre of card by a brass boss and is fitted with a spider of four brass arms, fitted with weights for balancing which radiate from central boss. Lower pivot secured to centre of card by a heavy brass boss which has two struts linking the two edge bar needles with the pivot.
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Object Details
| ID: | ACO1019 |
|---|---|
| Type: | Dry compass |
| Display location: | Not on display |
| Creator: | Dent, Edward John |
| Date made: | 1844 |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 42 mm; Diameter: 125 mm |