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Instrument type

circa 1260; Hispano-Moorish
Brass; 84 mm in diameter

The rim of the mater is riveted to the back plate, and has a scale of 60 parts, each subdivided into 3 parts. The inside of the mater has a latitude plate for 24 degrees. Shackle, with no extant suspension ring.

The rete has 21 named stars, the supports for the pointers pierces by one, two or three circles or a trefoil design. The ecliptic, with the sometimes abbreviated names of the zodiacal signs divided to 2 degrees, is supported by an east-west bar and four ties.

Four latitude plates, marked for latitudes 30 and 35?; 40 and 45?; 48 and 52?; 55 and 60?, with lines for every 5 degrees of altitude and 10 degrees of azimuth, circles for tropics and equator and lines for unequal hours.

The back has a zodiacal calendar (with the first point of Aires at the13th March), with the constellation names, each sign divided to 2 degrees, and the months named (sometimes abbreviated), each divided to 2 days. A double shadow square has each side divided to 6 parts, subdivided to 12, not numbered. A central circular table is unfinished.

There is a pin, counterchanged alidade (broken), each vane with two pinholes, and horse wedge.

Jim Bennett

Museum of the History of Science, Oxford
Inventory number 49033

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