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Dry compass
Dry compass
Card: Consists of a paper band attached to a metal circumference and metal centre by fine silk threads. The paper is white with black markings graduated to 1/4 points and quadrantally in degrees. There is also a 0 - 360 degree notation. There is a silver paper centre.
Pivot: Consists only of a thin aluminium "washer" which holds the radial silk threads.
Needle: The eight needles, four sets of two, are thin. They are suspended beneath the card by a different silk thread system to that of the card. Lengths 4", 3.5", 3.0" & 2.5" (10.2 cm, 8.8 cm, 7.6 cm & 6.4 cm)
Card: Consists of a paper band attached to a metal circumference and metal centre by fine silk threads. The paper is white with black markings graduated to 1/4 points and quadrantally in degrees. There is also a 0 - 360 degree notation. There is a silver paper centre.
Pivot: Consists only of a thin aluminium "washer" which holds the radial silk threads.
Needle: The eight needles, four sets of two, are thin. They are suspended beneath the card by a different silk thread system to that of the card. Lengths 4", 3.5", 3.0" & 2.5" (10.2 cm, 8.8 cm, 7.6 cm & 6.4 cm)
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Object Details
| ID: | ACO0872 |
|---|---|
| Type: | Dry compass |
| Display location: | Not on display |
| Creator: | Ch. Bianchetti & Co |
| Date made: | 1940 |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 8 mm; Diameter: 252 mm |