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Dry compass
Card-Mica covered with paper, blue with blue and black markings, graduated to 1/4 points and quadrantally in degrees.
Needle- Four 5" long needles hang on rings and eyelets attached to four brass strips 2 x 6.25" and 2 x 4.25" long, attached to a brass ring 6.6" dia. and screwed to card.
Pivot Cone-shaped brass pivot cap with jewel at top screwed through centre plate of light brass framework consisting of four long bars radiating from centre, the N-S arm carrying sliding weights, secured to brass ring of card.
Needle- Four 5" long needles hang on rings and eyelets attached to four brass strips 2 x 6.25" and 2 x 4.25" long, attached to a brass ring 6.6" dia. and screwed to card.
Pivot Cone-shaped brass pivot cap with jewel at top screwed through centre plate of light brass framework consisting of four long bars radiating from centre, the N-S arm carrying sliding weights, secured to brass ring of card.
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Object Details
| ID: | ACO0990 |
|---|---|
| Type: | Dry compass |
| Display location: | Not on display |
| Creator: | Unknown |
| Date made: | 1877 |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 20 mm; Diameter: 190 mm |