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  2. Fowler Calculators - Wikipedia

    en.wikipedia.org/wiki/Fowler_Calculators

    Following the patent and release of Harold's Long Scale calculator featuring two knobs on the outside rim in 1914, he designed the Magnum Long Scale calculator in 1927. [6] [7] As the name "Magnum" implies, it was a fairly large device at 4.5 inches in diameter—about 1.5 inches more than Fowler's average non-Magnum-series calculators. [8]

  3. List of scale model sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_scale_model_sizes

    Dollhouse for a dollhouse scale for 1:12 dollhouses. Commonly used for mini armor. 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 ...

  4. List of rail transport modelling scale standards - Wikipedia

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

    Model railway scales and gauges are standardized in NEM 010, [1] which covers several gauges for each scale. Narrow gauges are indicated by an additional letter added after the base scale as follows: no letter = standard gauge (1,250–1,700 mm or 49.2–66.9 in) m = metre gauge (850–1,250 mm or 33.5–49.2 in) e = narrow gauge (650–850 mm ...

  5. Rail transport modelling scales - Wikipedia

    en.wikipedia.org/.../Rail_transport_modelling_scales

    Narrow-gauge models in this gauge can be as large as 1:3 scale. 5-inch Live steam: 1:12: 127 mm or 121 mm Ridable, outdoor gauge. The gauge is 5 in (127 mm) in Europe, but 4 + 3 ⁄ 4 in (121 mm) in US and Canada. For standard gauge prototypes at 5 inch, the correct scale is 1 1 ⁄ 16 inch per foot or approximately 1:11.3. Alternatively 1.1/8 ...

  6. TI-99/4A - Wikipedia

    en.wikipedia.org/wiki/TI-99/4A

    TI-99/4. The TI-99/4 and TI-99/4A are home computers released by Texas Instruments in 1979 and 1981, respectively. [2] Based on Texas Instruments's own TMS9900 microprocessor originally used in minicomputers, the TI-99/4 was the first 16-bit home computer. [3] The associated TMS9918 video display controller provides color graphics and sprite ...

  7. OO gauge - Wikipedia

    en.wikipedia.org/wiki/OO_gauge

    OO gauge. OO gauge or OO scale (also, 00 gauge and 00 scale) is the most popular standard gauge model railway standard in the United Kingdom, [1] outside of which it is virtually unknown. OO gauge is one of several 4 mm-scale standards (4 mm to 1 ft (304.8 mm), or 1:76.2), and the only one to be marketed by major manufacturers. The OO track ...

  8. Mechanical calculator - Wikipedia

    en.wikipedia.org/wiki/Mechanical_calculator

    The 1/4-turn shaft carries (also, each column) gears with 12, 16, and 20 teeth, for 3, 4, and 5. Digits [1] and [2] are handled by 12 and 24-tooth gears on the 1/12-revolution shaft. Practical design places the 12th-rev. shaft more distant, so the 1/4-turn shaft carries freely-rotating 24 and 12-tooth idler gears.

  9. Miniature model (gaming) - Wikipedia

    en.wikipedia.org/wiki/Miniature_model_(gaming)

    Highly popular for World War II wargaming, 1/76 is roughly the same scale as 4 mm scale or OO model railways). Seldom used for RPGs. Airfix made a considerable range of figures in this scale: historically they were labelled on the box as "HO & OO scale" but are now described as 1/76 or 1/72 scale. 25 mm: ≈4.4 mm: ≈1:72 – 1:69