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  2. Display resolution standards - Wikipedia

    en.wikipedia.org/wiki/Display_resolution_standards

    After having used VGA-based 32 resolutions HVGA (480 × 320) and "Retina" DVGA (960 × 640) for several years in their iPhone and iPod products with a screen diagonal of 9 cm or 3.5 inches, Apple started using more exotic variants when they adopted the 16∶9 aspect ratio to provide a consistent pixel density across screen sizes: first 1136 ...

  3. History of measurement - Wikipedia

    en.wikipedia.org/wiki/History_of_measurement

    The Roman foot (~296 mm) was divided into both 12 unciae (inches) (~24.7 mm) and 16 digits (~18.5 mm). The Romans also introduced the mille passus (1000 paces) or double steps, the pace being equal to five Roman feet (~1480 mm). The Roman mile of 5000 feet (1480 m) was introduced into England during the occupation.

  4. Slug (unit) - Wikipedia

    en.wikipedia.org/wiki/Slug_(unit)

    A slug is defined as a mass that is accelerated by 1 ft/s 2 when a net force of one pound (lbf) is exerted on it. [2] One slug is a mass equal to 32.17405 lb (14.59390 kg) based on standard gravity, the international foot, and the avoirdupois pound. [3] In other words, at the Earth's surface (in standard gravity), an object with a mass of 1 ...

  5. Gunter's chain - Wikipedia

    en.wikipedia.org/wiki/Gunter's_chain

    The 66-foot (20.1 m) chain is divided into 100 links, usually marked off into groups of 10 by brass rings or tags which simplify intermediate measurement. Each link is thus 7.92 inches (201 mm) long. A quarter chain, or 25 links, measures 16 feet 6 inches (5.03 m) and thus measures a rod (or pole).

  6. 2 ft gauge railroads in the United States - Wikipedia

    en.wikipedia.org/wiki/2_ft_gauge_railroads_in...

    1⁄2 in ( 190.5 mm) gauge railway also present) (operating) Wild Kingdom Train (located in Lagoon) (separate 2 ft ( 610 mm) gauge railway named Pioneer Village Railroad and two separate 12 in ( 305 mm) gauge railways, the more recent one being named Lagoon Miniature Railway, previously present) (operating) Virginia.

  7. List of 2 ft 3 in gauge railways - Wikipedia

    en.wikipedia.org/wiki/List_of_2_ft_3_in_gauge...

    Blaenau Ffestiniog. There is evidence that Lord quarry (later part of the Votty & Bowydd quarry complex) and other North Wales slate quarries used 2 ft 3 in gauge tramways in the 1820s. [ 14] Plynlimon and Hafan Tramway [ 5] 1897. 1899. 7 miles (11.3 km) [ 5] Talybont, Wales. Short-lived line serving the lead mines around Hafan.

  8. Circular mil - Wikipedia

    en.wikipedia.org/wiki/Circular_mil

    A circular milis a unitof area, equal to the area of a circlewith a diameterof one mil(one thousandth of an inch or 0.0254 mm). It corresponds to approximately 5.067×10−4 mm2. It is a unit intended for referring to the area of a wire with a circular cross section.

  9. Inch - Wikipedia

    en.wikipedia.org/wiki/Inch

    12 ⁠ ft. Metric ( SI) units. 25.4 mm. A fire hydrant marked as 3-inch. The inch (symbol: in or ″) is a unit of length in the British Imperial and the United States customary systems of measurement. It is equal to ⁠ 1 36 ⁠ yard or ⁠ 1 12 ⁠ of a foot. Derived from the Roman uncia ("twelfth"), the word inch is also sometimes used to ...