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Station pointer
The station pointer consists of a graduated circle and three arms, one of which is fixed (at 0 degrees on the scale), while the other two can move around the circle and have fixing screws. The circle has a diameter of 7.25 inches (184 mm) and is made of brass with a silvered degree scale. The scale runs from 0 to 360 degrees, with 20-minute subdivisions, while verniers on the movable arms allow reading to 1 minute. It is contained in a fitted wooden case, which also holds wooden extension pieces for each of the arms, fixing screws (one of which is missing) and a magnifier for the scale.
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Object Details
| ID: | NAV0630 |
|---|---|
| Collection: | Astronomical and navigational instruments |
| Type: | Station pointer |
| Display location: | Display - Voyagers |
| Creator: | Cary |
| Date made: | circa 1830 |
| Exhibition: | Voyagers |
| Credit: | National Maritime Museum, Greenwich, London, Caird Collection |
| Measurements: | Overall: 30 mm x 540 mm x 200 mm |
| Parts: | Station pointer |
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