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Dry compass
Card-Mica covered with paper,white with black markings, graduated to 1/4 points and has decorated East point.
Needle- Four solid edge bar needles 2 x 4" and 2 x 3" long. Outer needles 0.3" deep, inner ones 0.3" deep at ends with semi-circular swell at centre 1.3" deep. The inner needles 1.25" apart, outer ones 0.5" outside inner two. Attached to a metal ring 3.75" dia. which is screwed to card. At the East point on this ring is a balancing disc.
Pivot-Cone-shaped brass pivot cap with jewel at top, screwed through centre of brass plate, having an expanded centre secured to inner needles by brass knee pieces.
Needle- Four solid edge bar needles 2 x 4" and 2 x 3" long. Outer needles 0.3" deep, inner ones 0.3" deep at ends with semi-circular swell at centre 1.3" deep. The inner needles 1.25" apart, outer ones 0.5" outside inner two. Attached to a metal ring 3.75" dia. which is screwed to card. At the East point on this ring is a balancing disc.
Pivot-Cone-shaped brass pivot cap with jewel at top, screwed through centre of brass plate, having an expanded centre secured to inner needles by brass knee pieces.
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Object Details
| ID: | ACO0953 |
|---|---|
| Type: | Dry compass |
| Display location: | Not on display |
| Creator: | Preston, Grant |
| Date made: | 1837-1840; 1837-40 |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 35 mm; Diameter: 105 mm |