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Liquid compass card
Liquid compass card
Card: The mica card is attached to the pivot by a boss and four diameters. The card is white with black markings graduated to quarter points and quadrantally in degrees.
Needle: The needles, six in all, one of clock spring steel and in two sets of three. The three needles are sandwiched between strips of cork, for buoyancy, and the whole is encased in a copper box. There are two of these boxes. The boxes are attached to the metal diameters.
Dims 5" x 1" x 0.75" (12.8 cm x 2.5 cm x 2 cm)
Pivot: A jewelled ball shaped pivot with a thumb screw at the top.
Card: The mica card is attached to the pivot by a boss and four diameters. The card is white with black markings graduated to quarter points and quadrantally in degrees.
Needle: The needles, six in all, one of clock spring steel and in two sets of three. The three needles are sandwiched between strips of cork, for buoyancy, and the whole is encased in a copper box. There are two of these boxes. The boxes are attached to the metal diameters.
Dims 5" x 1" x 0.75" (12.8 cm x 2.5 cm x 2 cm)
Pivot: A jewelled ball shaped pivot with a thumb screw at the top.
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Object Details
| ID: | ACO1041 |
|---|---|
| Type: | Liquid compass card |
| Display location: | Not on display |
| Creator: | J. G. West & Co |
| Date made: | circa 1850 |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 35 mm; Diameter: 155 mm |