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Dry compass
Card- Mica covered with paper. White with black and white markings, graduated to 1/4 points and quadrantally in degrees.
Needle- Four light compound needles made of two laminations of steel, grouped near the centre of card 0.6" apart, 2 x 7.2" and 2 x 7.4" long. Attached to a light metal ring which is screwed to card. A light brass cross frame, attached to the two inner needles, is fitted at centre to carry pivot.
Pivot- Small cone-shaped brass pivot cap with jewel at top, secured to centre of cross frame.
Needle- Four light compound needles made of two laminations of steel, grouped near the centre of card 0.6" apart, 2 x 7.2" and 2 x 7.4" long. Attached to a light metal ring which is screwed to card. A light brass cross frame, attached to the two inner needles, is fitted at centre to carry pivot.
Pivot- Small cone-shaped brass pivot cap with jewel at top, secured to centre of cross frame.
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Object Details
| ID: | ACO0942 |
|---|---|
| Type: | Dry compass |
| Display location: | Not on display |
| Creator: | Henry Barrow & Co |
| Date made: | 1837-1840; 1837-40 |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 15 mm; Diameter: 192 mm |