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Dry compass
Card- Mica covered with paper. White with black markings, graduated to 1/2 points with a decorated East point, edge of card graduated quadrantally in degrees. On underside are two metal balancing weights.
Needle- Flar bar type 6.9" (17.6cm) length with pointed ends and with a central aperture 2" (5cm) diameter to accommodate pivot gimbal. Attached to centre of needle is a ring or cylinder of brass, 0.5" x 2.5" diameter, to impart stability by lowering the centre of gravity.
Pivot- Inverted type mounted in double gimbal and attached to needle by two brass brackets.
Needle- Flar bar type 6.9" (17.6cm) length with pointed ends and with a central aperture 2" (5cm) diameter to accommodate pivot gimbal. Attached to centre of needle is a ring or cylinder of brass, 0.5" x 2.5" diameter, to impart stability by lowering the centre of gravity.
Pivot- Inverted type mounted in double gimbal and attached to needle by two brass brackets.
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Object Details
| ID: | ACO0934 |
|---|---|
| Type: | Dry compass |
| Display location: | Not on display |
| Creator: | Preston, Grant |
| Date made: | 1844 |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 27 mm; Diameter: 170 mm |
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