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Hot Water Cylinders
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 between the secant plane and cylinder axis, in the following way.:

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