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  2. Album cover - Wikipedia

    en.wikipedia.org/wiki/Album_cover

    An album cover (also referred to as album art) is the front packaging art of a commercially released studio album or other audio recordings. The term can refer to: the printed paperboard covers typically used to package: sets of 10 in (25 cm) and 12 in (30 cm) 78 rpm records. singles and sets of 12 in (30 cm) long-play records.

  3. Compass (drawing tool) - Wikipedia

    en.wikipedia.org/wiki/Compass_(drawing_tool)

    A compass, also commonly known as a pair of compasses, is a technical drawing instrument that can be used for inscribing circles or arcs. As dividers, it can also be used as a tool to mark out distances, in particular, on maps. Compasses can be used for mathematics, drafting, navigation and other purposes. Prior to computerization, compasses ...

  4. American wire gauge - Wikipedia

    en.wikipedia.org/wiki/American_wire_gauge

    American Wire Gauge ( AWG) is a logarithmic stepped standardized wire gauge system used since 1857, predominantly in North America, for the diameters of round, solid, nonferrous, electrically conducting wire. Dimensions of the wires are given in ASTM standard B 258. [ 1] The cross-sectional area of each gauge is an important factor for ...

  5. Circle of confusion - Wikipedia

    en.wikipedia.org/wiki/Circle_of_confusion

    At the ordinary distance of vision, of from twelve to fifteen inches, circles of confusion are seen as points, if the angle subtended by them does not exceed one minute of arc, or roughly, if they do not exceed the 1/100 of an inch in diameter. Numerically, 1/100 inch at 12–15 inches is closer to two minutes of arc.

  6. Aperture - Wikipedia

    en.wikipedia.org/wiki/Aperture

    Aperture. In biology, the pupil (appearing as a black hole) of the eye is its aperture and the iris is its diaphragm. In humans, the pupil can constrict to as small as 2 mm ( f/ 8.3) and dilate to larger than 8 mm ( f/ 2.1) in some individuals. In optics, the aperture of an optical system (including a system consisted of a single lens) is a ...

  7. Engineering drawing abbreviations and symbols - Wikipedia

    en.wikipedia.org/wiki/Engineering_drawing...

    In a feature control frame ( FCF ), the ⌀ symbol tells you that the tolerance zone for the geometric tolerance is cylindrical. Abbreviations for "diameter" include ⌀, DIA, and D. D. diameter; delta. Abbreviations for "diameter" include ⌀, DIA, and D. For delta usage, see for example "delta notes". DIA[ 2] diameter.

  8. File:CIRCLE 1.svg - Wikipedia

    en.wikipedia.org/wiki/File:CIRCLE_1.svg

    Diagram of a circle. This is a w:vector graphics version of w:Image:Circle-1.png which was licensed under the GFDL. Date: 3 December 2005: Source: Own work: Author: en:User:Optimager: Other versions: Derivative works of this file: CIRCLE 1 be-tarask.svg; CIRCLE 1 mk.svg; Circle-withsegments-notext.svg (no text, colour-coded)

  9. Curve of constant width - Wikipedia

    en.wikipedia.org/wiki/Curve_of_constant_width

    A standard example is the Reuleaux triangle, the intersection of three circles, each centered where the other two circles cross. [2] Its boundary curve consists of three arcs of these circles, meeting at 120° angles, so it is not smooth, and in fact these angles are the sharpest possible for any curve of constant width. [3]

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