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Compass card
Dry compass
Card: Consists of a paper band attached to the metal circumference and metal centre by fine silk threads. The paper is white with black markings graduated to quarter points and with two sets of quadrantal maarkings in degrees, one set being mirrored for use with a prism.
Needle: The six needles, in three sets of two, ar thin. They are suspended beneath the card on a different silk thread system to that of the card. Lengths 3.25" (8.3 cm), 2.75" (7.0 cm) and 2.0" (5.1 cm)
Pivot: Consists only of a thin aluminium "washer" which holds the radial silk threads
Card: Consists of a paper band attached to the metal circumference and metal centre by fine silk threads. The paper is white with black markings graduated to quarter points and with two sets of quadrantal maarkings in degrees, one set being mirrored for use with a prism.
Needle: The six needles, in three sets of two, ar thin. They are suspended beneath the card on a different silk thread system to that of the card. Lengths 3.25" (8.3 cm), 2.75" (7.0 cm) and 2.0" (5.1 cm)
Pivot: Consists only of a thin aluminium "washer" which holds the radial silk threads
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Object Details
| ID: | ACO1023 |
|---|---|
| Type: | Compass card |
| Display location: | Not on display |
| Creator: | Kelvin & James White Ltd; Thomson, William |
| Date made: | 1897 |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 10 mm; Diameter: 203 mm |
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