Herschelian Telescope

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a reflector designed by W. Herschel (1789), in which a concave parabolic mirror is inclined toward an incoming pencil of rays in such a way that the image is formed outside this pencil. The Herschelian telescope does not screen the rays, but it has aberrations. A similar system was proposed by M. V. Lomonosov in 1762.

N. N. MIKHEL’SON

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