- refractors
- re'frac·tor || rɪ'fræktə(r) n. something which causes refraction; refracting telescope, telescope that uses a lens or series of lenses to focus
English contemporary dictionary. 2014.
English contemporary dictionary. 2014.
Sky-Watcher — Infobox Company company type = Corporation foundation = 1980 location city = Richmond, British Columbia location country = Canada industry = Technology company slogan = For people curious enough to look up and wonder. homepage = http://www.sky… … Wikipedia
telescope — /tel euh skohp /, n., adj., v., telescoped, telescoping. n. 1. an optical instrument for making distant objects appear larger and therefore nearer. One of the two principal forms (refracting telescope) consists essentially of an objective lens… … Universalium
Refracting telescope — A refracting or refractor telescope is a dioptric telescope that uses a lens as its objective to form an image. The refracting telescope design was originally used in spy glasses and astronomical telescopes but is also used in other devices such… … Wikipedia
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astronomy — /euh stron euh mee/, n. the science that deals with the material universe beyond the earth s atmosphere. [1175 1225; ME astronomie ( < AF) < L astronomia < Gk. See ASTRO , NOMY] * * * I Science dealing with the origin, evolution, composition,… … Universalium
History of the telescope — The earliest known working telescopes appeared in 1608 and are credited to Hans Lippershey and Zacharias Janssen, spectacle makers in Middelburg, and Jacob Metius of Alkmaar. The design of these early refracting telescopes consisted of a convex… … Wikipedia
Newtonian telescope — The Newtonian telescope is a type of reflecting telescope invented by the British scientist Sir Isaac Newton (1642–1727), using a concave primary mirror and a flat diagonal secondary mirror. Newton’s first reflecting telescope was completed in… … Wikipedia
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Bowman Gum — was a Philadelphia based manufacturer of bubble gum and trading cards in the period surrounding World War II. Originally known as Gum, Inc., it produced a series of cards known as the Play Ball sets each year from 1939 to 1941. Production halted… … Wikipedia