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James Gregory (1638-75) Scottish mathematician. In 1663 he published 'Optica Promota' describing his reflecting telescope. Corresponded with Isaac Newton. Engraving from 'A Biographical Dictionary of Eminent Scotsmen' by Thomas Thomson (1870).

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Copyright: Irish Photo Archive
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James Gregory (1638-75) Scottish mathematician. In 1663 he published 'Optica Promota' describing his reflecting telescope. Corresponded with Isaac Newton. Engraving from 'A Biographical Dictionary of Eminent Scotsmen' by Thomas Thomson (1870).