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https://en.wikipedia.org/wiki/Burning_glass
https://en.wikipedia.org/wiki/Athanasius_Kircher#Technology
https://it.wikipedia.org/wiki/Archita https://en.wikipedia.org/wiki/Archytas
https://it.wikipedia.org/wiki/Vite_di_Archimede https://en.wikipedia.org/wiki/Archimedes
http://www.treccani.it/enciclopedia/iside/ https://en.wikipedia.org/wiki/Isis
http://www.treccani.it/enciclopedia/primo-mobile_(Enciclopedia-Dantesca)/