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  2. Robertson screw - Wikipedia

    en.wikipedia.org/wiki/Robertson_screw

    A Robertson screw, also known as a square screw [1] or Scrulox, [2] is a type of screw with a square-shaped socket in the screw head and a corresponding square protrusion on the tool. Both the tool and socket have a slight taper .

  3. Heights of presidents and presidential candidates of the ...

    en.wikipedia.org/wiki/Heights_of_presidents_and...

    The tallest U.S. president was Abraham Lincoln at 6 feet 4 inches (193 centimeters), while the shortest was James Madison at 5 feet 4 inches (163 centimeters). Donald Trump , the current president, is 6 feet 3 inches (190 centimeters) according to a physical examination summary from February 2019.

  4. List of tallest people - Wikipedia

    en.wikipedia.org/wiki/List_of_tallest_people

    Coyne's World War I draft registration card, dated 29 August, gave his height as 8 ft (240 cm), although he had reached a height of 8 ft 1.7 in (2.48 m), possibly 8 feet 4 inches (254 cm) by the time of his death. 1897–1921 (23) Brahim Takioullah: Morocco: 246 cm: 8 ft 1 in: Possesses the world's largest feet at 38 cm (1 ft 3 in). [25] [26]

  5. Rack unit - Wikipedia

    en.wikipedia.org/wiki/Rack_unit

    Rack with sample component sizes including an A/V half-rack unit. A rack unit (abbreviated U or RU) is a unit of measure defined as 1 + 3 ⁄ 4 inches (44.45 mm). [1] [2] It is most frequently used as a measurement of the overall height of 19-inch and 23-inch rack frames, as well as the height of equipment that mounts in these frames, whereby the height of the frame or equipment is expressed ...

  6. Friedmann–Lemaître–Robertson–Walker metric - Wikipedia

    en.wikipedia.org/wiki/Friedmann–Lemaître...

    The equivalence principle applied to each galaxy means distance measurements can be made using special relativity locally. So a distance d τ {\displaystyle d\tau } can be related to the local time t and the coordinates: c 2 d τ 2 = c 2 d t 2 − d x 2 − d y 2 − d z 2 {\displaystyle c^{2}d\tau ^{2}=c^{2}dt^{2}-dx^{2}-dy^{2}-dz^{2}} An ...

  7. Robert Wadlow - Wikipedia

    en.wikipedia.org/wiki/Robert_Wadlow

    Height and weight of Robert Wadlow, by age of measurement Age Height Weight Notes Size of Date Birth 1 ft 8 in (0.51 m) 8 lb 5 oz (3.8 kg) [16] Normal height and weight Average newborn February 22, 1918 6 months 2 ft 10 + 1 ⁄ 2 in (0.88 m) 30 lb (14 kg) [17] 2-year-old August 22, 1918 1 year 3 ft 6 in (1.07 m) 45 lb (20 kg)

  8. Comparison of the imperial and US customary measurement ...

    en.wikipedia.org/wiki/Comparison_of_the_imperial...

    [a] Originally defined as the volume of 10 pounds (4.54 kg) of distilled water (under certain conditions), [b] then redefined by the Weights and Measures Act 1985 to be exactly 4.546 09 L (277.4 cu in), the imperial gallon is close in size to the old ale gallon.

  9. List of scale model sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_scale_model_sizes

    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 railroad scale. Used in AD&D Battlesystem Skirmishes rules. Works with 15 mm miniatures where a 6 foot man would equal 15.24 mm 1:110: 2.771 mm