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Johannes or Johan Teyler (23 May 1648 – c.1709) was a Dutch Golden Age painter, engraver, mathematics teacher, and inventor of the color print. ==Biography== Teyler was born at Nijmegen. His father was William Taylor, a British or Scottish mercenary, who changed his name to Teyler.〔(Dutch Who's Who ) for Johannes Teyler〕 Johan studied Latin at the Latin school of Nijmegen and Mathematics at the Kwartierlijke Academie, where he wrote a dissertation in favor of Descartes.〔 After the death of his father, he studied in Leiden and afterwards acquired a post as Professor of Math and Philosophy in Nijmegen in 1670.〔 He was a respected professor but was overlooked for promotion due to his Cartesian ideas.〔 Through the mediation of his friend Gottfried Leibniz he attempted to acquire a professorship in Wolfenbüttel but gave up after discussions with Christiaan Huygens.〔 The rest of his career was outside Academia. In 1676 he became ''Vestingbouwkundige'' fortication manager for Frederick William I, Elector of Brandenburg during the Scanian War.〔 In 1678 he also became tutor for the Elector's sons.〔 Later the same year he was dismissed and returned to Nijmegen to receive backpay which was still owed him there. With the extra funds he undertook a trip to Italy, Egypt, the Holy Land and Malta, and later sent his diary to the Elector.〔 He later wrote a popular book on fortifications in 1688 called ''Architectura militaris'' (Rotterdam, 1688), and in the same year received a patent on a color printing process that involved using colored ink instead of just black ink when printing plates.〔 In 1695 he had a printing workshop in Rijswijk where he printed military-related works, but in 1697 he sold it and in 1698 undertook another trip to Berlin.〔 According to Houbraken he was a friend of Jacob de Heusch and a colleague in the Bentvueghels with the nickname ''Speculatie'', who travelled with De Heusch to Berlin in 1698.〔 (Joh. Tailler, anders Speculatie ), in ''De groote schouburgh der Nederlantsche konstschilders en schilderessen'' (1718) by Arnold Houbraken, courtesy of the Digital library for Dutch literature〕 They knew each other from their time in Rome as members of the Bentvueghel club, where Teyler also consorted with his former Math pupil from Nijmegen Jan van Call. According to the RKD where he is registered as a painter, he returned from Italy in 1683 and remained in Nijmegen except for his trip to Berlin.〔(Johan Teyler ) in the RKD〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Johan Teyler」の詳細全文を読む スポンサード リンク
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