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  2. Scale length (string instruments) - Wikipedia

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

    Cellos exist in a smaller range of sizes than violins, with 4/4, 3/4, 1/2, 1/4, 1/8, and 1/10 being reasonably common. As with the violin, the Stradivarius scale is regarded as standard for orchestral work; This is about 27.4 inches (700 mm). Violas are commonly described in terms of their body length rather than by a fraction. There are two ...

  3. List of track gauges - Wikipedia

    en.wikipedia.org/wiki/List_of_track_gauges

    Cape gauge (1,067 mm) Standard gauge (1,435 mm) Russian gauge (1,520 mm) Five foot gauge (1,524 mm) Irish gauge (1,600 mm) Iberian gauge (1,668 mm) Indian gauge (1,676 mm) This list presents an overview of railway track gauges by size. A gauge is measured between the inner faces of the rails.

  4. List of scale model sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_scale_model_sizes

    T scale, using 3 mm gauge track to represent standard gauge railways. 1:450. 0.677 mm. Model railways (T) T scale, using 3 mm gauge track to represent 3 ft 6 in ( 1,067 mm) gauge railways. Hasegawa also produces plastic ship models in this scale. 1:432.

  5. List of rail transport modelling scale standards - Wikipedia

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

    The 37.5 mm length is not derived by a certain scale ratio. 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 81⁄2 in) standard gauge standard gauge. Conversely, modeling standard gauge in Lego trains would yield a scaling of (37.5:1435 =) 1:38.3.

  6. Snellen chart - Wikipedia

    en.wikipedia.org/wiki/Snellen_chart

    The largest letter on an eye chart often represents an acuity of 6/60 (20/200), the value that is considered "legally blind" in the US. Many individuals with high myopia cannot read the large E without glasses, but can read the 6/6 (20/20) line or 6/4.5 (20/15) line with glasses. By contrast, legally blind individuals have a visual acuity of 6/ ...

  7. Orders of magnitude (length) - Wikipedia

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

    3.846 Mm – Length of U.S. Route 1 (from Fort Kent, Maine to Key West, Florida) 5.000 Mm – Width of the United States; 5.007 Mm – Estimated length of Interstate 90 (Seattle, Washington to Boston, Massachusetts) 5.614 Mm – Length of the Australian Dingo Fence; 6.371 Mm – Global-average Earth radius; 6.4 Mm – Length of the Great Wall ...

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