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  2. .50 BMG - Wikipedia

    en.wikipedia.org/wiki/.50_BMG

    The specified maximum diameter of an unfired .50 BMG bullet is 0.510-inch (13.0 mm); while this appears to be over the .50 inch (12.7 mm) maximum allowed for non-sporting Title I firearms under the U.S. National Firearms Act, the barrel of a .50 BMG rifle is only .50 inch (12.7 mm) across the rifling lands and slightly larger in the grooves ...

  3. Caliber - Wikipedia

    en.wikipedia.org/wiki/Caliber

    In the case of a 12-gauge (18.5 mm) shotgun, it would take 12 spheres the size of the shotgun's bore to equal a pound. [12] A numerically larger gauge indicates a smaller barrel: a 20-gauge (15.6 mm) shotgun requires more spheres to equal a pound; therefore, its barrel is smaller than the 12-gauge. This metric is used in Russia as "caliber ...

  4. Millimetre - Wikipedia

    en.wikipedia.org/wiki/Millimetre

    Different lengths as in respect to the electromagnetic spectrum, measured by the metre and its derived scales.The microwave is between 1 meter to 1 millimeter.. The millimetre (international spelling; SI unit symbol mm) or millimeter (American spelling) is a unit of length in the International System of Units (SI), equal to one thousandth of a metre, which is the SI base unit of length.

  5. United States Mint coin sizes - Wikipedia

    en.wikipedia.org/wiki/United_States_Mint_coin_sizes

    $2.50 Gold Quarter Eagle 18 mm 4.2 g 1796–1929 Small Cent 19.05 mm 2.5 g 1943 Small Cent ... Some variances in coin size and weight occurred over time, especially ...

  6. Orders of magnitude (length) - Wikipedia

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

    1.200 Mmwidth of Texas; 1.500 Mm – length of the Gobi Desert; 1.600 Mm – length of the Namib, the oldest desert on Earth; 2.000 Mm – distance from Beijing to Hong Kong as the crow flies; 2.300 Mm – length of the Great Barrier Reef; 2.800 Mm – narrowest width of Atlantic Ocean (Brazil-West Africa) 2.850 Mm – length of the Danube ...

  7. 16-inch/50-caliber Mark 7 gun - Wikipedia

    en.wikipedia.org/wiki/16-inch/50-caliber_Mark_7_gun

    The lightweight 16-in/50 Mark 7 was designed to resolve this conflict. These guns were 50 calibers long, 50 times their 16-inch (406 mm) bore diameter with barrels 66.7 ft (20.3 m) long, from chamber to muzzle. Each gun weighed about 239,000 lb (108 t) without the breech, and 267,900 lb (121.5 t) with the breech. [1]

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  9. List of motion picture film formats - Wikipedia

    en.wikipedia.org/wiki/List_of_motion_picture...

    54 mm unperforated (camera); 4 perf, 2 sides (projection) spherical 54 mm (two strips interleaved) spherical Eidoloscope [4] Woodville Latham: 1895 Griffo-Barnett Prize Fight: 51 mm 1.85 1.457" × 0.787" 4 perf, 2 sides spherical 51 mm 1.85 spherical Cinematographe: Lumière Brothers: 1895 La Sortie des Usines Lumiere: 35 mm 1.33 0.980" × 0.735"