parabolic arc

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• Parabolic aluminized reflector light — A Parabolic Aluminized Reflector luminaire 20 PAR cans A parabolic aluminized refle …   Wikipedia

• Parabolic constant — In mathematics, the ratio of the arc length of the parabolic segment formed by the latus rectum of any parabola to its focal parameter is a constant, denoted ! P 2 .In the diagram, the latus rectum is pictured in blue, the parabolic segment that… …   Wikipedia

• Arc Light —    Around 1900, the arc light or carbon arc began to replace the limelight, largely because the arc light was more economical. An extremely bright, even harsh, white light was produced by the electric spark that jumped between two carbon… …   The Historical Dictionary of the American Theater

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• Operation Arc Light — v · …   Wikipedia

• Deuterium arc lamp — A deuterium arc lamp (or simply deuterium lamp) is a low pressure gas discharge light source often used in spectroscopy when a continuous spectrum in the ultraviolet region is needed. Contents 1 Principle of operation 2 Deuterium lamp spectra 3… …   Wikipedia

• sun arc — noun : a large lamp that is used in making motion pictures and that reflects light by a parabolic mirror called also sun lamp, sun spot …   Useful english dictionary

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• Timeline of gravitational physics and relativity — Timeline of gravitational physics and general relativity* 800s Ja far Muhammad ibn Mūsā ibn Shākir hypothesizes that the heavenly bodies and celestial spheres are subject to the same laws of physics as Earth, unlike the ancients who believed that …   Wikipedia

• Envelope (mathematics) — In mathematics, an envelope of a family of manifolds (especially a family of curves) is a manifold that is tangent to each member of the family at some point.Envelope of a family of curvesThe simplest formal expression for an envelope of curves… …   Wikipedia