In 2013 we discovered a special drawing instrument in the Istanbul Museum of History of Science and Technology. Thanks to the support of Prof. Dr. Fuat Sezgin of the Institute for the History of Arabic-Islamic Science at the Johann Wolfgang Goethe University, Frankfurt am Main, I was able to investigate its origin and operation.
This GeoGebra book is part of my website on reflection points:
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[*] English: [url]http://www.fransvanschooten.nl/alhazen.htm[/url]
[*] Dutch: [url]http://www.fransvanschooten.nl/alhazen_nl.htm[/url]
[*] Turkish: [url]http://www.fransvanschooten.nl/alhazen_tk.htm[/url]
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