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Dry compass
Card- Mica covered with paper. White with black markings, graduated to 1/4 points and graduated quadrantally in degrees.
Needle- Single edge bar needle 7.5" length and made up of two laminations of rolled and hammered clock spring steel, each being shaped to a semi-circle at its centre, thus forming a circular aperture through which the pivot passes to engage in the cup.
Pivot- Said to be of ruby-unsighted.
Needle- Single edge bar needle 7.5" length and made up of two laminations of rolled and hammered clock spring steel, each being shaped to a semi-circle at its centre, thus forming a circular aperture through which the pivot passes to engage in the cup.
Pivot- Said to be of ruby-unsighted.
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Object Details
| ID: | ACO0936 |
|---|---|
| Type: | Dry compass |
| Display location: | Not on display |
| Creator: | Robinson, Thomas Charles; Robinson |
| Date made: | 1837-1840; 1837-40 |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 23 mm; Diameter: 192 mm |
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