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  2. Caliber - Wikipedia

    en.wikipedia.org/wiki/Caliber

    Calibers fall into four general categories by size: [citation needed] miniature-bore historically refers to calibers with a diameter of 0.22 inches (5.6 mm) or smaller; small-bore refers to calibers with a diameter of 0.32 inches (8.1 mm) or smaller; medium-bore refers to calibers with a diameter of 0.33 inches (8.4 mm) to 0.39 inches (9.9 mm)

  3. 7.92×57mm Mauser - Wikipedia

    en.wikipedia.org/wiki/7.92×57mm_Mauser

    The M/88 bore originally had 7.90 mm (0.311 in) lands diameter and 8.10 mm (0.319 in) grooves diameter. The M/88 barrel bore specification was changed by 1894–1895 to 7.90 mm (0.311 in) lands diameter and 8.20 mm (0.323 in) grooves diameter to improve accuracy and reduce barrel wear in M/88 chambered arms. [4]

  4. Orders of magnitude (length) - Wikipedia

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

    The millimetre (SI symbol: mm) is a unit of length in the metric system equal to 10 −3 metres (⁠ 1 / 1 000 ⁠ m = 0.001 m). To help compare different orders of magnitude, this section lists lengths between 10 −3 m and 10 −2 m (1 mm and 1 cm). 1.0 mm – 1/1,000 of a meter; 1.0 mm – 0.03937 inches or 5/127 (exactly)

  5. 7 mm caliber - Wikipedia

    en.wikipedia.org/wiki/7_mm_caliber

    An overview of 7mm caliber cartridges, their history, and uses in firearms.

  6. 7×57mm Mauser - Wikipedia

    en.wikipedia.org/wiki/7×57mm_Mauser

    European 7 mm cartridges all have 7.24 mm (0.285 in) grooves diameter. American 7 mm cartridges have 7.21 mm (0.284 in) grooves diameter. According to the official C.I.P. (Commission Internationale Permanente pour l'Epreuve des Armes à Feu Portatives) rulings the 7×57mm case can handle up to 390.00 MPa (56,565 psi) P max piezo pressure.

  7. 8 mm caliber - Wikipedia

    en.wikipedia.org/wiki/8_mm_caliber

    This article is missing information about "7.92 mm" Mauser and members of the lineage (besides x33, which is already here). Please expand the article to include this information. Further details may exist on the talk page .

  8. Mohenjo-daro - Wikipedia

    en.wikipedia.org/wiki/Mohenjo-daro

    A ruler found at Lothal (2400 BCE) is calibrated to about 1.6 mm (1 ⁄ 16 in). [46] The decimal subdivision on the ruler is noteworthy, as it predates the modern metric system by 3000 years or more. The base unit used was known as the angula (finger) and is about 17 mm. A piece of shell found in Mackay's excavation is very precisely incised ...

  9. Metre - Wikipedia

    en.wikipedia.org/wiki/Metre

    One metre is exactly equivalent to ⁠ 5 000 / 127 ⁠ inches and to ⁠ 1 250 / 1 143 ⁠ yards. A simple mnemonic to assist with conversion is "three 3s": 1 metre is nearly equivalent to 3 feet 3 + 3 ⁄ 8 inches. This gives an overestimate of 0.125 mm. The ancient Egyptian cubit was about 0.5 m (surviving rods are 523–529 mm). [154]

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