ID: 115
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A cordiform - heart-shaped - horary quadrant marked with Gunter scales.
$8.000
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Description
A small and charming but very fine heart-shaped horary quadrant marked with Gunter scales. The scales are very finely engraved on both sides.
The quadrant was a very practical, functional, and portable instrument used for navigation. A horary quadrant is used to find the time of day by measuring the Sun’s altitude. As the quadrant became smaller and thus more portable, its value for navigation was soon realized. The first documented use of the quadrant to navigate at sea is in 1461, by Diogo Gomes.
Sailors began by measuring the height of Polaris to ascertain their latitude.
In 1618 English Mathematician Edmund Gunter further adapted the quadrant with an invention that came to be known as the Gunter quadrant.
The pocket-sized quadrant was revolutionary because it was inscribed with projections of the tropics, the equator, the horizon and the ecliptic. With the correct tables, one could use the quadrant to find the time, the date, the length of the day or night, the time of sunrise and sunset and the meridian.
The Gunter quadrant was extremely useful but had drawbacks; the scales only applied to a certain latitude.
Specifications
- Your stock number
- -
- Maker / Publisher
- ANONYMOUS
- Place
- ca. 1720-1760
- Date
- ca. 1720-1760
- Color
- Uncoloured
- Height
- 160
- Width
- 61
- Condition
- Brass. Good condition.
- Reference
- A Butterfield ring dial of similar design but smaller, is illustrated in Sundial at Greenwich, Hester Highton, OUP 2001, page 200, catalogue no. 186.
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- Item Location
- Amsterdam, Alabama, United States
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- United States, United Kingdom, Albania, Argentina, Armenia, Australia, Azerbaijan, Bahamas, Belgium, Bermuda, Cambodia, Canada, Chile, China, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Gibraltar, Greece, Greenland, Guatemala, Hong Kong, Iceland, India, Indonesia, Israel, Italy, Japan, Latvia, Lithuania, Luxembourg, Malta, Mexico, Monaco, Netherlands, Norway, Singapore, Spain, Sweden, Switzerland, Turkey
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- No pick-ups
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