Torquetum

The torquetum or turquet is a medieval astronomical instrument designed to take and convert measurements made in three sets of coordinates: Horizon, equatorial, and ecliptic. In a sense, the Torquetum is an analog computer. The first torquetum is thought to have been built by Jabir ibn Aflah (Geber) in the 12th century or 13th century, though the ...
Found on http://en.wikipedia.org/wiki/Torquetum

torquetum

(from the article `protractor`) ...0° to 180°. It is an ancient device that was already in use during the 13th century. At that time, European instrument makers constructed an ...
Found on http://www.britannica.com/eb/a-z/t/63
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