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  2. Nominal Pipe Size - Wikipedia

    en.wikipedia.org/wiki/Nominal_Pipe_Size

    Nominal Pipe Size (NPS) is a North American set of standard sizes for pipes used for high or low pressures and temperatures. [1] " Nominal" refers to pipe in non-specific terms and identifies the diameter of the hole with a non-dimensional number (for example – 2-inch nominal steel pipe" consists of many varieties of steel pipe with the only criterion being a 2.375-inch (60.3 mm) outside ...

  3. List of scale model sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_scale_model_sizes

    1:33: 9.236 mm The most common scale for paper model kits of aircraft. 1:32: 3⁄8" 9.525 mm: Model railways (1) Aircraft models. Car models. Toy soldiers. 54 mm figure scale toy soldiers are supposed to use this scale as well. Same as Gauge 1, cars, common for slot cars. Commonly referred to as Stablemate size in model horses. 1:30.5: 10 mm

  4. French catheter scale - Wikipedia

    en.wikipedia.org/wiki/French_catheter_scale

    [1] The Charrière is measured by the ''outer'' diameter, and is defined as 1 Fr = 1/3 mm, and thus 1 mm = 3 Fr; therefore the diameter of a round catheter in millimetres can be determined by dividing the French size by 3. [2] The French units roughly correspond to the outer circumference of the catheter (see table below).

  5. British Standard Pipe - Wikipedia

    en.wikipedia.org/wiki/British_Standard_Pipe

    (in −1) (mm) (in) (mm) (in) (mm) (in) (mm) (mm) (mm) 1 ⁄ 16: 28: 0.907 0.3041 7.723 0.2583 6.561 5 ⁄ 32: 4.0 6.6: 6.8 18: 28: 0.907 0.3830 9.728 0.3372 8.566 5 ⁄ 32: 4.0 8.6: 8.8 1 ⁄ 4: 19: 1.337 0.5180 13.157 0.4506 11.445 0.2367: 6.0 11.5: 11.8 3 ⁄ 8: 19: 1.337 0.6560 16.662 0.5886 14.950 1 ⁄ 4: 6.4 15.0: 15.3 1 ⁄ 2: 14: ...

  6. f-number - Wikipedia

    en.wikipedia.org/wiki/F-number

    In the following quote, an "apertal ratio" of "1 ⁄ 24" is calculated as the ratio of 6 inches (150 mm) to 1 ⁄ 4 inch (6.4 mm), corresponding to an f /24 f-stop: In every lens there is, corresponding to a given apertal ratio (that is, the ratio of the diameter of the stop to the focal length), a certain distance of a near object from it ...

  7. National pipe thread - Wikipedia

    en.wikipedia.org/wiki/National_pipe_thread

    The half-angle (between the taper surface and the axis of the pipe) is arctan(1 ⁄ 32) ≈ 1.7899° ≈ 1° 47′. The standard for Nominal Pipe Size (often abbreviated NPS, which should not be confused with the abbreviation NPS for the straight thread form standard) is loosely related to the inside diameter of Schedule 40 series of sizes.

  8. Image sensor format - Wikipedia

    en.wikipedia.org/wiki/Image_sensor_format

    The common 1" outside diameter circular video camera tubes have a rectangular photo sensitive area about 16 mm on the diagonal, so a digital sensor with a 16 mm diagonal size is a 1" video tube equivalent. The name of a 1" digital sensor should more accurately be read as "one inch video camera tube equivalent" sensor.

  9. 4 ft 8 in gauge railways - Wikipedia

    en.wikipedia.org/wiki/4_ft_8_in_gauge_railways

    4 ft 8 in gauge railways are railways with a track gauge of 4 ft 8 in / 1,422 mm. This gauge is 1 ⁄ 2 inch (13 mm) less than 4 ft 8 + 1 ⁄ 2 in ( 1,435 mm ) standard gauge The first such railways were the Killingworth Railway [ 1 ] [ 2 ] and the Stockton and Darlington Railway [ note 1 ]