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  2. Orders of magnitude (length) - Wikipedia

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

    15 cm = 1.5 dm – length of a Bic pen with cap on; 22 cm = 2.2 dm – diameter of a typical association football (soccer ball) 30 cm = 3 dm – typical school-use ruler length (= 300 mm) 30.48 cm = 3.048 dm – 1 foot (measure) 60 cm = 6 dm – standard depth (front to back) of a domestic kitchen worktop in Europe (= 600 mm)

  3. Foot (unit) - Wikipedia

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

    The Egyptian equivalent of the foot—a measure of four palms or 16 digits—was known as the djeser and has been reconstructed as about 30 cm (11.8 in). The Greek foot (πούς, pous) had a length of ⁠ 1 / 600 ⁠ of a stadion, [12] one stadion being about 181.2 m (594 ft); [13] therefore a foot was, at the time, about 302 mm (11.9 in). Its ...

  4. Inch - Wikipedia

    en.wikipedia.org/wiki/Inch

    2.54 centimeters (1 inch is exactly 2.54 cm) 25.4 millimetres (1 inch is exactly 25.4 mm) ⁠ 1 / 12 ⁠ or 0.08333 feet (approximately) ⁠ 1 / 36 ⁠ or 0.2777 yards (approximately) 10000 'tenths' [a] 1000 thou [b] or mil [c] 100 points [d] or gries [e] 72 PostScript points [f] 10, [g] [e] 12, [h] or 40 [i] lines; 6 computer picas [j] 3 ...

  5. Irish units of measurement - Wikipedia

    en.wikipedia.org/wiki/Irish_units_of_measurement

    0.7 cm 1/4 inch ordlach: thumb-length 1 ⁄ 12: 2.1 cm 0.8 in bas: palm 1 ⁄ 3: 8.4 cm 3.3 in dorn: fist 5 ⁄ 12 or 1 ⁄ 2: 10.4 or 12.5 cm 4 or 5 in troighid: foot 1 25 cm 9.9 in céim: step 2.5 62.5 cm 2 ft 1 in deiscéim[m] double-step 6 1.5 m 4 ft 11 in fertach: rod 12 3 m 9 ft 10 in forrach: 144 36 m 39.4 yards

  6. Slide rule - Wikipedia

    en.wikipedia.org/wiki/Slide_rule

    For example, a 10 cm (3.9 in) circular would have a maximum precision approximately equal to a 31.4 cm (12.4 in) ordinary slide rule. Circular slide rules also eliminate "off-scale" calculations, because the scales were designed to "wrap around"; they never have to be reoriented when results are near 1.0—the rule is always on scale.

  7. 55th Air Defense Artillery Regiment - Wikipedia

    en.wikipedia.org/wiki/55th_Air_Defense_Artillery...

    Description; A gold color metal and enamel device 13 ⁄ 16 inch (2.1 cm) in width consisting of a red triangle in outline point up with gold center. In base the Arabic numerals 55 in red, on the tops of the numerals a caterpillar in red and above the caterpillar the symbol used on the French battle maps to indicate the position of 155mm guns in black (a disc with an arrow with doubled barbs ...