angular spacing

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• Sentence spacing — Double sentence spaced typewriter text (1946) vs. single sentence spaced typeset text (1979) Sentence spacing is the horizontal space between sentences in typeset text. It is a matter of typographical convention …   Wikipedia

• Diffraction — Computer generated intensity pattern formed on a screen by diffraction from a square aperture …   Wikipedia

• Double-slit experiment — Slit experiment redirects here. For other uses, see Diffraction. Quantum mechanics …   Wikipedia

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• Backstaff — Not to be confused with Ballastella. Davis quadrant from the beginning of the 18th century The backstaff or back quadrant is a navigational instrument that was used to measure the altitude of a celestial body, in particular the sun or moon. When… …   Wikipedia

• Stadiametric rangefinding — Stadiametric rangefinding, or the stadia method is a technique of measuring distances with a telescopic instrument. The term stadia comes from a Greek unit of length. Stadiametric rangefinding is used for surveying and in the telescopic sights of …   Wikipedia

• Phase-shift keying — Passband modulation v · d · e Analog modulation AM · …   Wikipedia

• Fenestron — A Fenestron is a fully enclosed tail rotor of a helicopter that is essentially a ducted fan. The housing is integral with the tail skin, and, like the conventional tail rotor it replaces, is intended to counteract the torque of the main rotor. It …   Wikipedia

• Echelle grating — An echelle grating (from French, échelle , meaning stairs or ladder) is a type of diffraction grating which is characterised by a relatively low grooves density but is optimized for high diffraction orders. Echelle gratings are, like other types… …   Wikipedia

• spectroscopy — spectroscopist /spek tros keuh pist/, n. /spek tros keuh pee, spek treuh skoh pee/, n. the science that deals with the use of the spectroscope and with spectrum analysis. [1865 70; SPECTRO + SCOPY] * * * Branch of analysis devoted to identifying… …   Universalium

• Correspondence principle — This article discusses quantum theory and relativity. For other uses, see Correspondence principle (disambiguation). In physics, the correspondence principle states that the behavior of systems described by the theory of quantum mechanics (or by… …   Wikipedia