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Cylinder Simple English Wikipedia, the free encyclopedia.
In differential geometry, a cylinder is defined more broadly as a ruled surface which is spanned by a oneparameter family of parallel lines. A cylinder whose cross section is an ellipse, parabola, or hyperbola is called an elliptic cylinder, parabolic cylinder, or hyperbolic cylinder respectively.

Cylinder Wikipedia.
In the case of a right circular cylinder with a cylindric section that is an ellipse, the eccentricity e of the cylindric section and semimajor axis a of the cylindric section depend on the radius of the cylinder r and the angle between the secant plane and cylinder axis, in the following way.:

Hot Water Cylinders PlumbNation.co.uk.
Cylinders are manufactured in two distinct styles, either as an unvented cylinder that work off mains pressure water, or the vented cylinder, otherwise known as a gravity fed hot water system. At PlumbNation, we stock various types and sizes of hot water cylinders to suit the need of any installation.

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