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Horary quadrant with Gunter projection
Surveyor's quadrant.
This is a horary quadrant marked with Gunter scales and a surveyors shadow square in the top third. The revolving volvelle on the back of the instrument is a planisphere and shows the constellations near Polaris, the pole star. This was probably a later addition. The plumb line and bob are missing.
Reverse has hours marked I-XII in each semicircle with a volvelle showing the celestial vault.
This is a horary quadrant marked with Gunter scales and a surveyors shadow square in the top third. The revolving volvelle on the back of the instrument is a planisphere and shows the constellations near Polaris, the pole star. This was probably a later addition. The plumb line and bob are missing.
Reverse has hours marked I-XII in each semicircle with a volvelle showing the celestial vault.
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Object Details
| ID: | NAV1030 |
|---|---|
| Collection: | Astronomical and navigational instruments |
| Type: | Horary quadrant with Gunter projection |
| Display location: | Display - ROG |
| Creator: | Unknown |
| Date made: | Late 17th century |
| Credit: | National Maritime Museum, Greenwich, London, Caird Collection |
| Measurements: | Radius: 178 mm |