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Dry compass - surveying
Kater’s prismatic compass.
Bowl: Brass, glazed. Two spirit levels set on bottom. White bone piece marked with lubber line. Bowl stands on separate brass platform which has three adjusting screws. Front and back sights.
Card: Mica with green circular strip around outside. Graduated to 360 deg. One cross strut.
Needle: Flat bar type with pivot stud at centre.
Sights: Front: Hinged hollow arch with a sliding glazed frame. This sight operats stop mechanism when lowered. Back: Fixed prism with slit and peep hole.
O.A. Height: 8.75" (22.4cm)
Box dims: 8.75" x 8.75" x 4.5" (22.2cm x 22.2cm x 11.4cm)
Bowl: Brass, glazed. Two spirit levels set on bottom. White bone piece marked with lubber line. Bowl stands on separate brass platform which has three adjusting screws. Front and back sights.
Card: Mica with green circular strip around outside. Graduated to 360 deg. One cross strut.
Needle: Flat bar type with pivot stud at centre.
Sights: Front: Hinged hollow arch with a sliding glazed frame. This sight operats stop mechanism when lowered. Back: Fixed prism with slit and peep hole.
O.A. Height: 8.75" (22.4cm)
Box dims: 8.75" x 8.75" x 4.5" (22.2cm x 22.2cm x 11.4cm)
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Object Details
| ID: | ACO0128 |
|---|---|
| Type: | Dry compass - surveying |
| Display location: | Display - Polar Worlds Gallery |
| Creator: | Henry Barrow & Co; Kater |
| Vessels: | Isabelle fl.1818 |
| Date made: | Unknown |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 95 mm x 210 mm x 210 mm |
| Parts: | Dry compass - surveying |