Fromthesereports,andusinghisowntechnicalskillsasamathematicianandasacraftsman,GalileobegantomakeaseriesoftelescopeswhoseopticalperformancewasmuchbetterthanthatoftheDutchinstrument.
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From these reports, and using his own technical skills as a mathematician and as a craftsman, Galileo began to make a series of telescopes whose optical performance was much better than that of the Dutch instrument.