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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 edge bar needles made of two laminations of steel spaced 1.8" apart, 2 x 7.25" and 2 x 4.8" long. Attached to a light metal ring which is screwed to card. A brass cross frame, attached to the inner two needles, is fitted at centre to carry pivot cap. Below the cross frame is a brass strip with a small aperture through which the pivot passes to the cap.
Pivot- Small cone-shaped brass pivot with a jewel at top, secured to centre of cross frame.
Needle- Four light compound edge bar needles made of two laminations of steel spaced 1.8" apart, 2 x 7.25" and 2 x 4.8" long. Attached to a light metal ring which is screwed to card. A brass cross frame, attached to the inner two needles, is fitted at centre to carry pivot cap. Below the cross frame is a brass strip with a small aperture through which the pivot passes to the cap.
Pivot- Small cone-shaped brass pivot with a jewel at top, secured to centre of cross frame.
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Object Details
| ID: | ACO0943 |
|---|---|
| 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 |