NationMaster - Encyclopedia: Cylindrical

For the geometric object, see Cylinder (geometry).
For the engine component, see Cylinder (engine).
In firearms the cylinder is the rotating device that contains the firing chambers of a revolver.
The phonograph cylinder was the dominant medium of audio storage from the 1870s to the 1910s, and continued in limited use (such as in the dictaphone) through the mid 20th century.
A cylinder is also a type of lens and a form of refraction error.
And see gas cylinder.

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Categories: Disambiguation | Firearm components

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Cylindrical Map Projections (1163 words)
	The normal aspect for cylindrical projections assumes that the cylinder is tangent to the globe along the Equator.
	Cylindrical stereographic projections are rarely used, although Gall's stereographic projection has been proposed as compromise projection having less distortion of distances than the cylindrical gnomonic projection and less distortion of shapes than the cylindrical orthographic projection.
	The cylindrical orthographic projection assumes that the light source is an infinite distance from the projection surface, resulting in parallel rays of light.

GDT: Cylindrical Specifications (482 words)
	The surface must lie between the two cylindrical surface which bound the tolerance zone and are determined by a best-fit nominal cylinder.
	Since the roundness or cylindricity tolerance is a radial distance between concentric boundaries, a radial method of checking the surface is necessary.
	To truly check for the roundness or cylindricity of a surface without regard to the axis of the part, the part must be rotated about the ultra-precision spindle of a specialized roundness measuring machine.

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