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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- Six light edge bar needles composed of one thin strip of steel with the ends bevelled of sharply, 2 x 7", 2 x 5.25" and 2 x 6.25" long, and 0.25" deep. The two inner needles 2" apart and the rest 1" apart. Attached to a light metal ring which is screwed to card.
Pivot-Missing, screwed through centre of light framework which has two short arms secured to the inner needles and two long arms attached to the metal ring of card, in the N-S direction, these carrying sliding weights.
Needle- Six light edge bar needles composed of one thin strip of steel with the ends bevelled of sharply, 2 x 7", 2 x 5.25" and 2 x 6.25" long, and 0.25" deep. The two inner needles 2" apart and the rest 1" apart. Attached to a light metal ring which is screwed to card.
Pivot-Missing, screwed through centre of light framework which has two short arms secured to the inner needles and two long arms attached to the metal ring of card, in the N-S direction, these carrying sliding weights.
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Object Details
| ID: | ACO0992 |
|---|---|
| Type: | Dry compass |
| Display location: | Not on display |
| Creator: | Unknown |
| Date made: | 1885 |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 10 mm; Diameter: 192 mm |