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  2. List of rail transport modelling scale standards - Wikipedia

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

    While HO scale is a 1:87 scale (3.5 mm to 1 foot), resulting in a 16.5 mm (0.65 in) gauge from real life prototype 1,435 mm (4 ft 8 + 1 ⁄ 2 in) standard gauge standard gauge. Conversely, modeling standard gauge in Lego trains would yield a scaling of (37.5:1435 =) 1:38.3.

  3. List of scale model sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_scale_model_sizes

    1:3: 4 in: 101.60 mm P scale - ridable narrow gage park railroads, steamrollers, traction engines, Ball-jointed dolls, Super Dollfie, Dollfie Dream 1:2.4: 5 in: 127.00 mm Park railroads, where 15 in (381 mm) minimum gauge models are based on 3 ft (914 mm) narrow gauge prototypes 1:2: 6 in: 152.40 mm "My Size" (3 ft) fashion dolls: 1:1.8 ...

  4. Millimetre - Wikipedia

    en.wikipedia.org/wiki/Millimetre

    On a metric ruler, the smallest measurements are normally millimetres. [3] High-quality engineering rulers may be graduated in increments of 0.5 mm. Digital callipers are commonly capable of reading increments as small as 0.01 mm. [4] Microwaves with a frequency of 300 GHz have a wavelength of 1

  5. Ring size - Wikipedia

    en.wikipedia.org/wiki/Ring_size

    In the United States, Canada, and Mexico, ring sizes are specified using a numerical scale with 14 steps, where whole sizes differ by 0.032 inches (0.81 mm) of internal diameter, equivalent to 0.1005 inches (2.55 mm) of internal circumference.

  6. Scale length (string instruments) - Wikipedia

    en.wikipedia.org/wiki/Scale_length_(string...

    For example, a 7/8 violin has a scale of about 317 mm, a 3/4-size instrument a scale of 307 mm, a half-size one 287 mm, and a quarter-size one 267 mm. 1/8, 1/10, 1/16 and 1/32 and even 1/64 violins also exist, becoming progressively smaller, but again in no proportional relationship. (A full-size instrument is described as 4/4.)

  7. Orders of magnitude (length) - Wikipedia

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

    The millimetre (SI symbol: mm) is a unit of length in the metric system equal to 10 −3 metres (⁠ 1 / 1 000 ⁠ m = 0.001 m). To help compare different orders of magnitude , this section lists lengths between 10 −3 m and 10 −2 m (1 mm and 1 cm).

  8. Audio tape specifications - Wikipedia

    en.wikipedia.org/wiki/Audio_tape_specifications

    As well as 14 in (6.4 mm) tape, studio and multitrack machines use tape widths of 1 ⁄ 2, 1, and 2 inches (12.7, 25.4, and 50.8 mm), and at least one 3 inches (76.2 mm) [citation needed] machine was available for a time. There is also a 35 mm width, but this variety is more similar to the motion picture stock of the same width. It is ...

  9. Drill bit sizes - Wikipedia

    en.wikipedia.org/wiki/Drill_bit_sizes

    So a 1 / 2 in (12.7 mm) diameter drill will be able to drill a hole 4 + 1 / 2 in (114.3 mm) deep, since it is 9 times the diameter in length. A 1 / 8 in (3.175 mm) diameter drill can drill a hole 1 + 5 / 8 in (41.275 mm) deep, since it is 13 times the diameter in flute length. [3]