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  2. American wire gauge - Wikipedia

    en.wikipedia.org/wiki/American_wire_gauge

    By definition, No. 36 AWG is 0.005 inches in diameter, and No. 0000 is 0.46 inches in diameter. The ratio of these diameters is 1:92, and there are 40 gauge sizes from No. 36 to No. 0000, or 39 steps. Because each successive gauge number increases cross sectional area by a constant multiple, diameters vary geometrically.

  3. Circular mil - Wikipedia

    en.wikipedia.org/wiki/Circular_mil

    A circular mil is a unit of area, equal to the area of a circle with a diameter of one mil (one thousandth of an inch or 0.0254 mm). It corresponds to approximately 5.067 × 10−4 mm2. It is a unit intended for referring to the area of a wire with a circular cross section. As the definition of the unit contains π, it is easy to calculate area ...

  4. 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.

  5. ANSI/ASME Y14.1 - Wikipedia

    en.wikipedia.org/wiki/ANSI/ASME_Y14.1

    A size chart illustrating the ANSI sizes. In 1992, the American National Standards Institute adopted ANSI/ASME Y14.1 Decimal Inch Drawing Sheet Size and Format, [1] which defined a regular series of paper sizes based upon the de facto standard 8 + 1 ⁄ 2 in × 11 in "letter" size to which it assigned the designation "ANSI A".

  6. Shooting target - Wikipedia

    en.wikipedia.org/wiki/Shooting_target

    Shooting target. A "splatter"-type paper target — 25 shots at a distance of 91 metres (100 yd), all hitting inside the bullseye within a 25 millimetres (1 in) grouping. An electronic scoreboard used for stangskyting in Norway in 2007 showing the number of hits for each shooter after the first half. Shooting targets are objects in various ...

  7. Turning radius - Wikipedia

    en.wikipedia.org/wiki/Turning_radius

    The turning radius (alternatively, turning diameter or turning circle) of a vehicle defines the minimum dimension (typically the radius or diameter, respectively) of available space required for that vehicle to make a semi-circular U-turn without skidding. The Oxford English Dictionary describes turning circle as "the smallest circle within ...

  8. Point (typography) - Wikipedia

    en.wikipedia.org/wiki/Point_(typography)

    In typography, the point is the smallest unit of measure. It is used for measuring font size, leading, and other items on a printed page. The size of the point has varied throughout printing's history. Since the 18th century, the size of a point has been between 0.18 and 0.4 millimeters. Following the advent of desktop publishing in the 1980s ...

  9. Engineering drawing abbreviations and symbols - Wikipedia

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

    bolt circle: BCD or B.C.D. bolt circle diameter: BHC bolt hole circle Same definition as the bolt circle diameter BHCS: button head cap screw: Like an SHCS but with a button head. BHN: Brinell hardness number: BoM or BOM: bill of materials: Also called a list of materials (LM or L/M). Overlaps a lot in concept with a parts list (PL or P/L ...