Beschreibung:

A European brass single-plate astrolabe, seemingly for near the 52° latitude line, the 4 7/8-inch(12.4cm.) mater with .15-inch (.35cm.) thick limb, the front divided with one scale of time, twenty four hours I-XII-I-XII , in four-minute intervals (one degree=four minutes of time), the hours labelled in Roman numeralsm the cast-brass rete cut to a simple pattern of circles with approximately sixty star-pointers, (thirty-five inside the ecliptic circle, twenty-five outside; eighteen named), parts of the framework with dots in a small circle possibly indicating further star positions, the plate engraved with the stereographicprojection for 52.G as engraved on the limb, the back engraved with the circles for the equator and tropics only, the back with degree scale divided in single degrees and numbered every ten in four quadrents, the calendar scale eccentric inside the Zodiac scale, the point of Aries at 10.5 March, with unequal hour diagram and shadow square, lacks alidade and pin, late 16th/early 17th century See colour plate