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Dry compass
Dry compass
Card: White paper band set on a light aluminium frame work. The card is white with black markings graduated to 1/2 points and quadrantally in degrees. The quadrantal markings are for use with a prism. There is a small weight on paper.
Pivot: Aluminium and jewel pivot set at centre of two diameters.
Needle: The six needles in two sets of three are slung beneath the card and in between the pivot and a circular construction. The needles appear to be suspended in that position by threads which formed a diameter on the E-W axis. There are screw attachments to tighten or slacken off the threads. Length of needles 2.5", 2.25", 2.0" (6.3 cm, 5.7 cm, 5.1 cm)
Card: White paper band set on a light aluminium frame work. The card is white with black markings graduated to 1/2 points and quadrantally in degrees. The quadrantal markings are for use with a prism. There is a small weight on paper.
Pivot: Aluminium and jewel pivot set at centre of two diameters.
Needle: The six needles in two sets of three are slung beneath the card and in between the pivot and a circular construction. The needles appear to be suspended in that position by threads which formed a diameter on the E-W axis. There are screw attachments to tighten or slacken off the threads. Length of needles 2.5", 2.25", 2.0" (6.3 cm, 5.7 cm, 5.1 cm)
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Object Details
| ID: | ACO1374 |
|---|---|
| Type: | Dry compass |
| Display location: | Not on display |
| Creator: | Unknown |
| Date made: | before 1917 |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 23 mm; Diameter: 190 mm |
| Parts: | Dry compass |