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concentric objects. Two major definitions of "spiral" in the American Heritage Dictionary are: a curve on a plane that winds around a fixed center point at...

optics the term "Cornu spiral" is used.: 432  The Cornu spiral can be used to describe a diffraction pattern. Consider a plane wave with phasor amplitude...

spiral, equiangular spiral, or growth spiral is a self-similar spiral curve that often appears in nature. The first to describe a logarithmic spiral was...

Fermat's spiral or parabolic spiral is a plane curve with the property that the area between any two consecutive full turns around the spiral is invariant...

mathematics, a conical spiral, also known as a conical helix, is a space curve on a right circular cone, whose floor projection is a plane spiral. If the floor...

The Archimedean spiral (also known as Archimedes' spiral, the arithmetic spiral) is a spiral named after the 3rd-century BC Greek mathematician Archimedes...

in-plane bar. The bulk of the stars in a spiral galaxy are located either close to a single plane (the galactic plane) in more or less conventional circular...

certain footraces, and is used to model spiral galaxies and architectural volutes. As a plane curve, a hyperbolic spiral can be described in polar coordinates...

names for this phenomenon include suicide spiral, deadly spiral, death spiral and vicious spiral. Graveyard spirals are most common at night or in poor weather...

In the mathematics of circle packing, a Doyle spiral is a pattern of non-crossing circles in the plane in which each circle is surrounded by a ring of...

well-defined disk. Even in the case of a barred spiral galaxy like the Milky Way, defining the galactic plane is slightly imprecise and arbitrary since the...

The Mikoyan-Gurevich MiG-105, part of the Spiral program, was a crewed test vehicle to explore low-speed handling and landing. It was a visible result...

A transition curve (also, spiral easement or, simply, spiral) is a spiral-shaped length of highway or railroad track that is used between sections having...

perturbations due to the Galactic spiral arms and non-uniform mass distributions. In addition, the Sun passes through the Galactic plane approximately 2.7 times...

The Ulam spiral or prime spiral is a graphical depiction of the set of prime numbers, devised by mathematician Stanisław Ulam in 1963 and popularized in...

Spiral similarity is a plane transformation in mathematics composed of a rotation and a dilation. It is used widely in Euclidean geometry to facilitate...

A right hand spiral bevel gear is one in which the outer half of a tooth is inclined in the clockwise direction from the axial plane through the midpoint...

to the spiral. He defines the spiral as: If a straight line one extremity of which remains fixed is made to revolve at a uniform rate in a plane until...

Squadron. The plane Bradley was flying spun out of control as he went into a sharp turn at about 5,000 feet. Stunned witnesses saw the plane spiral slowly into...

in the mathematics of plane curves, a Cotes's spiral (also written Cotes' spiral and Cotes spiral) is one of a family of spirals classified by Roger Cotes...