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Dry compass
Card-Mica covered with paper, blue with blue and black markings, graduated to 1/4 points and quadrantally in degrees.
Needle- Four heavy needles, 2 x 6.5" and 2 x 4.5" long, each composed of threee laminations of steel, attached by rings and eyelets attached to brass ring 5.85" dia. and screwed to card.
Pivot Cone-shaped brass pivot cap with white metal bearing at top screwed through centre of light metal framework which has two short arms attached by rings and eyelets to the centre of the two inner needles and two long arms, carrying sliding weights, secured to metal ring of card.
Needle- Four heavy needles, 2 x 6.5" and 2 x 4.5" long, each composed of threee laminations of steel, attached by rings and eyelets attached to brass ring 5.85" dia. and screwed to card.
Pivot Cone-shaped brass pivot cap with white metal bearing at top screwed through centre of light metal framework which has two short arms attached by rings and eyelets to the centre of the two inner needles and two long arms, carrying sliding weights, secured to metal ring of card.
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Object Details
| ID: | ACO0991 |
|---|---|
| Type: | Dry compass |
| Display location: | Not on display |
| Creator: | Unknown |
| Date made: | 1877 |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 20 mm; Diameter: 190 mm |