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Dry card compass
Bowl: Copper painted black. Stands on three legs and has a stop mechanism outside wall. Glazed. Painted white inside with black lubber line. One black bar support for pivot holder attached to inside wall. Glazed top is removable.
Card: Paper covered mica. Blue with black markings graduated 0 - 90 deg quadrantally and in quarter points. Decorated North point. Screw bar runs N-S with brass weights. Balancing weight on underside. Diameter 7.55" (19.4cm) Both cards are identical.
Needle: Two parallel bar needles held in position by brass cross strut. Length 6.5" (1.5cm) x 0.5" (0.6cm) wide.
Pivot: Brass pivot going into a jewelled pivot cap. Stop mechanism slides up pivot support. Both card boxes contain spare pivots.
O.A. Height 7.5" (19.1cm)
Card: Paper covered mica. Blue with black markings graduated 0 - 90 deg quadrantally and in quarter points. Decorated North point. Screw bar runs N-S with brass weights. Balancing weight on underside. Diameter 7.55" (19.4cm) Both cards are identical.
Needle: Two parallel bar needles held in position by brass cross strut. Length 6.5" (1.5cm) x 0.5" (0.6cm) wide.
Pivot: Brass pivot going into a jewelled pivot cap. Stop mechanism slides up pivot support. Both card boxes contain spare pivots.
O.A. Height 7.5" (19.1cm)
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Object Details
| ID: | ACO0126 |
|---|---|
| Type: | Dry card compass |
| Display location: | Display - Polar Worlds Gallery |
| Creator: | Unknown |
| Events: | Exploration: Challenger expedition, 1872-1876; Antarctic Exploration: British National Antarctic Expedition, 1901-1904 Antarctic Exploration: British Antarctic Expedition, 1910-1913 |
| Vessels: | Challenger (1858); Discovery (1901) Terra Nova fl.1910 |
| Date made: | Unknown |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 192 mm x 240 mm x 220 mm |
| Parts: | Dry card compass |