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. |

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 one-parameter 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 semi-major axis a of the cylindric section depend on the radius of the cylinder r and the angle α between the secant plane and cylinder axis, in the following way.: |