cylindrical reflector
51Fabry-Pérot interferometer — In optics, a Fabry Pérot interferometer or etalon is typically made of a transparent plate with two reflecting surfaces, or two parallel highly reflecting mirrors. (Technically the former is an etalon and the latter is an interferometer, but the… …
52TV and FM DX — TV DX and FM DX is the active search for distant radio or television stations received during unusual atmospheric conditions. The term DX is an old telegraphic term meaning long distance. VHF/UHF television and radio signals are normally limited… …
53New Horizons — For other uses, see New Horizons (disambiguation). New Horizons Operator NASA Major contractors Applied Physics Laboratory (APL) Southwest Research Institute (SwRI) …
54Oven — depicted in a painting by Jean François Millet An oven is a thermally insulated chamber used for the heating, baking or drying of a substance.[1] It is most commonly used for cooking …
55Erygmascope — An erygmascope is the name given to a late 19th century electric lighting apparatus designed for the examination of the strata of earth traversed by boring apparatus.It consisted of a very powerful incandescent lamp enclosed in a metallic… …
56Russian Woodpecker — Steel Yard redirects here. For the weight measuring device, see Steelyard balance. Coordinates: 51°18′16″N 30°03′53″E / 51.3045404°N 30.0647736°E …
57List of mathematics articles (B) — NOTOC B B spline B* algebra B* search algorithm B,C,K,W system BA model Ba space Babuška Lax Milgram theorem Baby Monster group Baby step giant step Babylonian mathematics Babylonian numerals Bach tensor Bach s algorithm Bachmann–Howard ordinal… …
58List of mathematics articles (E) — NOTOC E E₇ E (mathematical constant) E function E₈ lattice E₈ manifold E∞ operad E7½ E8 investigation tool Earley parser Early stopping Earnshaw s theorem Earth mover s distance East Journal on Approximations Eastern Arabic numerals Easton s… …
59Mobile weapons — This article is about fictional weapons from the Gundam series. For mobile weapons in the real world, see Maneuver warfare. In the Gundam terminology, the terms normal suit (Universal Century) and astrosuit (After Colony) are used to refer to… …
60Special Astrophysical Observatory of the Russian Academy of Science — The Special Astrophysical Observatory ( ru. Специальная Астрофизическая Обсерватория), or SAO RAS for short, is an astronomical observatory, set up in 1966 in the USSR, now operated by the Russian Academy of Sciences. Based in the Bolshoi… …
