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Dry compass
Dry compass
Card: Mica covered with paper, white with black markings, graduated to quarter points.
Needle: Single steel needle, T shaped with the vertical fin cut away at the centre to accommodate the jewel cap. The centre of needle is slightly expanded. 6.75" in length.
Pivot: The jewel cap is carried in a brass stem 0.5" above the face of the card and screwed through the centre of the needle.
Card: Mica covered with paper, white with black markings, graduated to quarter points.
Needle: Single steel needle, T shaped with the vertical fin cut away at the centre to accommodate the jewel cap. The centre of needle is slightly expanded. 6.75" in length.
Pivot: The jewel cap is carried in a brass stem 0.5" above the face of the card and screwed through the centre of the needle.
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Object Details
| ID: | ACO1014 |
|---|---|
| Type: | Dry compass |
| Display location: | Not on display |
| Creator: | Unknown |
| Date made: | 1844 |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 40 mm; Diameter: 170 mm |