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Hadley's Gregorian reflecting telescope, c.1740 | Science Museum Group Collection
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An Account of a Catadioptrick Telescope, Made by John Hadley, Esq; FRSWith the Description of a Machine Contriv'd by Him for the Applying It to Use . 37^.51.-^. FlG.111 Stock Photo - Alamy
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Reflecting the heavens | The Renaissance Mathematicus