Gregory [Gregorie], James (1638-75)

Details Gregory [Gregorie], James (1638-75) Gregory [Gregorie], James (1638-75)

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000eaa..booke3664.&link_type=abstract

"Encyclopedia of Astronomy and Astrophysics, Edited by Paul Murdin, article 3664. Bristol: Institute of Physics Publishing, 2001

Astronomy and Astrophysics

Astronomy

History And Archaeoastronomy, Biographies

Scientific paper

Scottish mathematician and optician, born in Aberdeen. Gregory described in Optica Promota a design (which he never realized) for the first practical reflecting telescope in which a perforated primary concave parabolic mirror converges the light to the focus of a concave ellipsoidal secondary mirror. The light is reflected back to the ellipsoid's second focus behind the main mirror. A real image ...

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