On 28 April 2012 Professor Dr Ahmad Yusuf al-Hassan Gabarin passed away. He was one of the most important historians of Islamic science and technology. Specialist of the various aspects of Islamic technology, the late A. Y. al-Hassan left a rich corpus of books and articles covering almost all aspects of the contributions made in the classical Islamic era to engineering, technology and industry.
An Obituary: Professor Ahmad Y. al-Hassan
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Figure 1. The Tabula Rogeriana, drawn by al-Idrisi for Roger II of Sicily in 1154, one of the most advanced ancient world maps. Modern consolidation, created from the 70 double-page spreads of the original atlas. (Source)
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