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3-inch/50-caliber gun. The 3"/50-caliber gun (spoken "three-inch fifty-caliber") in United States naval gun terminology indicates the gun fired a projectile 3 inches (76 mm) in diameter, and the barrel was 50 calibers long (barrel length is 3 in × 50 = 150 in or 3.8 m). Different guns (identified by Mark numbers) of this caliber were used by ...
3-inch ordnance rifle. The 3-inch ordnance rifle, model 1861 was a wrought iron muzzleloading rifled cannon that was adopted by the United States Army in 1861 and widely used in field artillery units during the American Civil War. It fired a 9.5 lb (4.3 kg) projectile to a distance of 1,830 yd (1,670 m) at an elevation of 5°.
Designed to be small and compact, the Model 36 has been produced with 2-inch (1.875 inch actual length) or 3-inch barrels with fixed sights. A version with an adjustable rear sight, the Model 50 Chief's Special Target, was also produced in limited numbers with both 2-inch and 3-inch barrels.
Subdivisions of an inch are typically written using dyadic fractions with odd number numerators; for example, two and three-eighths of an inch would be written as 2 + 3 / 8 ″ and not as 2.375″ nor as 2 + 6 / 16 ″. However, for engineering purposes fractions are commonly given to three or four places of decimals and have been for many years.
Fixed (rear notch; front ramp) The Smith & Wesson Model 13 (Military & Police Magnum) is a .357 Magnum revolver designed for military and police use. It is based on Smith & Wesson's K-frame—specifically, it is a .357 Magnum version of the heavy-barrel variant of the .38 Special Model 10 (originally called the Military & Police).
Nominal Pipe Size (NPS) is a North American set of standard sizes for pipes used for high or low pressures and temperatures. " Nominal" refers to pipe in non-specific terms and identifies the diameter of the hole with a non-dimensional number (for example – 2-inch nominal steel pipe" consists of many varieties of steel pipe with the only criterion being a 2.375-inch (60.3 mm) outside diameter).
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