semi-circular curvature

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• Radius of curvature (applications) — The distance from the center of a sphere or ellipsoid to its surface is its radius. The equivalent surface radius that is described by radial distances at points along the body s surface is its radius of curvature (more formally, the radius of… …   Wikipedia

• Nordström's theory of gravitation — In theoretical physics, Nordström s theory of gravitation was a predecessor of general relativity. Strictly speaking, there were actually two distinct theories proposed by the Finnish theoretical physicist Gunnar Nordström, in 1912 and 1913… …   Wikipedia

• Flat Earth — For other uses, see Flat Earth (disambiguation). The Flammarion engraving (1888) depicts a traveller who arrives at the edge of a flat Earth and sticks his head through the firmament …   Wikipedia

• Greek temple — Greek temples (Ancient Greek: polytonic|ὁ ναός , gr. ho naós dwelling , semantically distinct from Latin la. templum temple ) were structures built to house the cult statues within Greek sanctuaries. The temples themselves did usually not… …   Wikipedia

• Sector instrument — A five sector mass spectrometer A sector instrument is a general term for a class of mass spectrometer that uses a static electric or magnetic sector or some combination of the two (separately in space) as a mass analyzer.[1] A popular… …   Wikipedia

• Molding (decorative) — For other uses, see Molding (disambiguation). Cavetto molding and resulting shadow pattern Ovolo molding and resulting shadow pattern …   Wikipedia

• Kitchen knife — A kitchen knife is any knife that is intended to be used in food preparation. While much of this work can be accomplished with a few general purpose knives – notably a large chef s knife, a tough cleaver, and a small paring knife – there are also …   Wikipedia

• McKeen Motor Car Company — McKeen car Roslyn of the Northern Pacific Railroad. The McKeen Motor Car Company of Omaha, Nebraska was a builder of internal combustion engined railroad motor cars (railcars), constructing 152 between 1905–1917.[1] Founded by William McKeen, the …   Wikipedia

• Beijing city fortifications — The city wall of Beijing was a fortification built around 1435. It was 23.5 km long. The thickness at ground level was 20m and the top 12m. The wall was 15m high, and it had nine gates. This wall stood for nearly 530 years, but in 1965 it was… …   Wikipedia

• Conic section — Types of conic sections: 1. Parabola 2. Circle and ellipse 3. Hyperbola …   Wikipedia

• Mass — This article is about the scientific concept. For the substance of which all physical objects consist, see Matter. For other uses, see Mass (disambiguation). Classical mechanics …   Wikipedia