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telescope; and he did it with the object of
avoiding colour dispersion.
Some time elapsed before reflectors were
much used. Pound and Bradley used one
presented to the Royal Society by Hadley in
1723. Hawksbee, Bradley, and Molyneaux
made some. But James Short, of Edin-
burgh, made many excellent Gregorian re-
flectors from 1732 till his death in 1768.
405
