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Dry compass
Card-Mica covered with paper, white with black and white markings, graduated to 1/4 points. At centre of card is a hole 2" diameter to accommodate pivot gimbal.
Needle- four heavy edge bar needles of rolled and hammered steel. the two central needles 6.75" long, each of two laminations, 0.5" deep at ends, each having an auxiliary needle, semi-circular in shape, attached to the centre. The two outer needles are 4" long and 0.5" deep and have two laminations each mounted 2" apart and attached to a light metal ring which is screwed to the card.
Pivot- Inverted type mounted in double gimbals dia. 1.75", attached to the two central needles by brass brackets. The pivot pin is adjustable vertically by being threaded.
Needle- four heavy edge bar needles of rolled and hammered steel. the two central needles 6.75" long, each of two laminations, 0.5" deep at ends, each having an auxiliary needle, semi-circular in shape, attached to the centre. The two outer needles are 4" long and 0.5" deep and have two laminations each mounted 2" apart and attached to a light metal ring which is screwed to the card.
Pivot- Inverted type mounted in double gimbals dia. 1.75", attached to the two central needles by brass brackets. The pivot pin is adjustable vertically by being threaded.
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Object Details
| ID: | ACO0948 |
|---|---|
| Type: | Dry compass |
| Display location: | Not on display |
| Creator: | Henry Barrow & Co |
| Date made: | 1837-1840; 1837-40 |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 60 mm; Diameter: 180 mm |
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