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  2. Concentric objects - Wikipedia

    en.wikipedia.org/wiki/Concentric_objects

    The region of the plane between two concentric circles is an annulus, and analogously the region of space between two concentric spheres is a spherical shell. [6] For a given point c in the plane, the set of all circles having c as their center forms a pencil of circles. Each two circles in the pencil are concentric, and have different radii.

  3. Mangle (machine) - Wikipedia

    en.wikipedia.org/wiki/Mangle_(machine)

    This process takes much less time than ironing with the usual iron and ironing board. There were many electric rotary ironers on the American market including Solent, Thor, Ironrite and Apex. By the 1940s the list had grown to include Bendix, General Electric, Kenmore and Maytag. [ 4 ]

  4. Ironing - Wikipedia

    en.wikipedia.org/wiki/Ironing

    Ironing a shirt. Ironing is the use of an iron, usually heated, to remove wrinkles and unwanted creases from fabric. [1] The heating is commonly done to a temperature of 180–220 °C (360–430 °F), depending on the fabric. [2] Ironing works by loosening the bonds between the long-chain polymer molecules in the fibres of the material. While ...

  5. Distortion (optics) - Wikipedia

    en.wikipedia.org/wiki/Distortion_(optics)

    In geometric optics, distortion is a deviation from rectilinear projection; a projection in which straight lines in a scene remain straight in an image.It is a form of optical aberration that may be distinguished from other aberrations such as spherical aberration, coma, chromatic aberration, field curvature, and astigmatism in a sense that these impact the image sharpness without changing an ...

  6. Clothes iron - Wikipedia

    en.wikipedia.org/wiki/Clothes_iron

    Box iron, ironing box, charcoal iron, ox-tongue iron or slug iron [3] Mentioned above; the base is a container, into which hot coals or a metal brick or slug can be inserted to keep the iron heated. The ox-tongue iron is named for the particular shape of the insert, referred to as an ox-tongue slug.

  7. Gnomonic projection - Wikipedia

    en.wikipedia.org/wiki/Gnomonic_projection

    Gnomonic projection of a portion of the north hemisphere centered on the geographic North Pole The gnomonic projection with Tissot's indicatrix of deformation. A gnomonic projection, also known as a central projection or rectilinear projection, is a perspective projection of a sphere, with center of projection at the sphere's center, onto any plane not passing through the center, most commonly ...