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  2. Caliber conversion device - Wikipedia

    en.wikipedia.org/wiki/Caliber_conversion_device

    Since most cartridge cases are only about 5 cm (2.0 in) long, this provides a limited power advantage. On the other hand, these will function from magazines in the same way as supplemental chambers, and allow the use of inexpensive rimfire ammunition in firearms chambered in .22 caliber (5.56 mm) or smaller. [citation needed]

  3. French catheter scale - Wikipedia

    en.wikipedia.org/wiki/French_catheter_scale

    The French scale measures and is proportional to the outer diameter of a catheter, with 1 French (Fr) defined as 1 ⁄ 3 millimeter, making the relationship: 1 mm = 3 Fr. Thus, the outer diameter of a catheter in millimeters can be calculated by dividing the French size by 3. [ 2 ]

  4. List of scale model sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_scale_model_sizes

    Used for 12 mm, and 12.5 mm figure scale miniature wargaming. 1:128: 3 ⁄ 32 in: 2.381 mm A few rockets and some fit-in-the-box aircraft are made to this size. 1:120: 0.1 in: 2.54 mm: Model railways (TT) Derived from the scale of 1 inch equals 10 feet.TT model railroad scale. Used in AD&D Battlesystem Skirmishes rules. Works with 15 mm ...

  5. Orders of magnitude (length) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(length)

    1.0 mm – 0.03937 inches or 5/127 (exactly) 1.0 mm – side of a square of area 1 mm²; 1.0 mm – diameter of a pinhead; 1.5 mm – average length of a flea [27] 2.54 mm – distance between pins on old dual in-line package (DIP) electronic components; 5 mm – length of an average red ant; 5 mm – diameter of an average grain of rice

  6. Inch - Wikipedia

    en.wikipedia.org/wiki/Inch

    The United States adopted the conversion factor 1 metre = 39.37 inches by an act in 1866. [30] In 1893, Mendenhall ordered the physical realization of the inch to be based on the international prototype metres numbers 21 and 27, which had been received from the CGPM, together with the previously adopted conversion factor. [31]

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  8. Track gauge conversion - Wikipedia

    en.wikipedia.org/wiki/Track_gauge_conversion

    Also in the 19th century, in the United States, some 5 ft (1524 mm) broad-gauge locomotives were designed for easy conversion to 1,435 mm (4 ft 8 + 1 ⁄ 2 in) gauge, and in the United Kingdom some 7 ft 1 ⁄ 4 in (2140 mm) broad-gauge locomotive classes of the Great Western Railway were designed for easy conversion to 1435 mm (4 ft 8 + 1 ⁄ 2 ...

  9. Conversion of units - Wikipedia

    en.wikipedia.org/wiki/Conversion_of_units

    Conversion of units is the conversion of the unit of measurement in which a quantity is expressed, typically through a multiplicative conversion factor that changes the unit without changing the quantity. This is also often loosely taken to include replacement of a quantity with a corresponding quantity that describes the same physical property.