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  2. List of rail transport modelling scale standards - Wikipedia

    en.wikipedia.org/wiki/List_of_rail_transport...

    S 1:64 22.45 mm (0.884 in) S-scale is the same proportion in NEM, NMRA and the UK. S Scale Model Railway Society is the custodian of British S-scale. O14: 1:43.5: 14 mm (0.551 in) For accurately representing 2 ft narrow gauge in 7 mm scale. 0 or 7 mm: 1:43.5: 32 mm (1.26 in) Three sub-standards: coarse, unified and fine.

  3. On30 gauge - Wikipedia

    en.wikipedia.org/wiki/On30_gauge

    Layout Stirmouth & Southern Railroad Company in On30 gauge, based on the Bachmann Industries models.. On30 (also called On2 1 ⁄ 2, O16.5 and Oe) gauge is the modelling of narrow gauge railways in O scale on HO (16.5 mm / 0.65 in) gauge track in 1:48 scale ratio by American and Australian model railroaders, in 1:43.5 scale ratio by British and French model railroaders and 1:45 by Continental ...

  4. On2 gauge - Wikipedia

    en.wikipedia.org/wiki/On2_gauge

    The difference of On2 scale, compared to its nearest alternative (On30), is that On2 scale equates to the correct track gauge for 2 ft prototypes - such as Maine "Two Footers" and the many industrial operations that used or continue to use this gauge - including existing 21st century sugar cane operations in Australia, Fiji, Indonesia.

  5. OO gauge - Wikipedia

    en.wikipedia.org/wiki/OO_gauge

    OO scale (left) and HO scale (right) models of the EMD Class 66, showing the size difference. OO scale permits a level of detail including weathering and individual numbering. 16.5 mm (0.65 in) gauge at 4 mm:1 foot means that the scale gauge represents 4 ft 1 + 1 ⁄ 2 in (1,257 mm), 7 inches (178 mm) narrower than the prototype 4 ft 8 + 1 ...

  6. Representative elementary volume - Wikipedia

    en.wikipedia.org/wiki/Representative_elementary...

    Schematic illustration of idealized fiber arrays and their corresponding unit cells. In the theory of composite materials, the representative elementary volume (REV) (also called the representative volume element (RVE) or the unit cell) is the smallest volume over which a measurement can be made that will yield a value representative of the whole. [1]

  7. Revolutions per minute - Wikipedia

    en.wikipedia.org/wiki/Revolutions_per_minute

    Thus a disc rotating at 60 rpm is said to have an angular speed of 2π rad/s and a rotation frequency of 1 Hz. The International System of Units (SI) does not recognize rpm as a unit. It defines units of angular frequency and angular velocity as rad s −1 , and units of frequency as Hz , equal to s −1 .

  8. Turn (angle) - Wikipedia

    en.wikipedia.org/wiki/Turn_(angle)

    An arc of a circle with the same length as the radius of that circle corresponds to an angle of 1 radian. A full circle corresponds to a full turn, or approximately 6.28 radians, which is expressed here using the Greek letter tau (τ). Some special angles in radians, stated in terms of 𝜏. A comparison of angles expressed in degrees and radians.

  9. Vernier scale - Wikipedia

    en.wikipedia.org/wiki/Vernier_scale

    The use of the vernier scale is shown on a vernier caliper which measures the internal and the external diameters of an object. The vernier scale is constructed so that it is spaced at a constant fraction of the fixed main scale. So for a vernier with a constant of 0.1, each mark on the vernier is spaced 9/10 of those on the main scale.

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