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The resulting answer is the diameter of the shot in hundredths of an inch. For example, #2 shot gives 17−2 = 15, meaning that the diameter of #2 shot is 15 ⁄ 100 or 0.15 in (3.8 mm). B shot is 0.170 in (4.3 mm), and sizes go up in 0.01 in (0.25 mm) increments for BB and BBB sizes.
Woodblock printing had been known in China for centuries. It was innovations in type casting that made for Gutenberg's breakthrough of commercially printing. [1] Although using matrices was a technique known well before his time, Johannes Gutenberg adapted their use to a conveniently adjustable hand mould, enabling one to easily and accurately cast identical multiple instances of any character.
The headstamp may have a 2- or 3-symbol letter, number, or alphanumeric code indicating the place of manufacture. [14] This is usually followed by two digits indicating the last two digits of the year of manufacture; they may have additional digits or a letter indicating the month or yearly quarter of manufacture.
It was determined that the weapon was too heavy and had too much recoil for mobile mountings, so a new weapon based on the barrel of the lighter and less powerful 3-inch gun M1898 was developed, designated the 3-inch gun M1918. This was the standard US anti-aircraft gun until partially replaced by the 3-inch gun M3 in 1930; some M1918 guns saw ...
The 3-inch/23-caliber gun (spoken "three-inch-twenty-three-caliber") was the standard anti-aircraft gun for United States destroyers through World War I and the 1920s. United States naval gun terminology indicates the gun fired a projectile 3 inches (76 mm) in diameter, and the barrel was 23 calibers long (barrel length is 3" × 23 = 69" or 1.75 meters.) [1]
The 3-inch rifle could hurl a shell 4,180 yd (3,822 m) at 16° elevation. [14] Unlike a smoothbore cannon, the 3-inch rifle's projectile retained two-thirds of its muzzle velocity at 1,500 yd (1,372 m) – or 839 ft/s (256 m/s) – so that its rifled projectile was invisible in flight.
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