Definition of "cassegrainian telescope" []

• A reflecting telescope invented by Cassegrain, which differs from the Gregorian only in having the secondary speculum convex instead of concave, and placed nearer the large speculum. The Cassegrainian represents objects inverted; the Gregorian, in their natural position. The Melbourne telescope (see Illust. under Reflecting telescope, below) is a Cassegrainian telescope. (noun)

Gnu Collaboartive International Dictionary of English: licensed under The Code Project Open License (CPOL)