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Dry compass
Card-Mica painted white with black markings graduated to 1/4 points, has decorated East point. At centre of card is a hole 1.25" dia. to accommodate pivot.
Needle- Four solid edge bar needles, 2x 4" and 2 x 3" long, 0.5" deep, the inner needles 1.3" apart, outer needles 0.6" outside inner ones, screwed to card.
Pivot- Inverted type carried in double brass gimbals mounted through hole at centre of card, and secured to the two inner needles by brass knee pieces.
Needle- Four solid edge bar needles, 2x 4" and 2 x 3" long, 0.5" deep, the inner needles 1.3" apart, outer needles 0.6" outside inner ones, screwed to card.
Pivot- Inverted type carried in double brass gimbals mounted through hole at centre of card, and secured to the two inner needles by brass knee pieces.
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Object Details
| ID: | ACO0950 |
|---|---|
| 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: 20 mm; Diameter: 110 mm |