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2. Piping and plumbing fitting - Wikipedia

   en.wikipedia.org/wiki/Piping_and_plumbing_fitting

   Short-radius (or regular) 45° elbow (copper sweat) Long-radius (or sweep) 90° elbow (copper sweat) An elbow is installed between two lengths of pipe (or tubing) to allow a change of direction, usually a 90° or 45° angle; 22.5° elbows are also available.

3. Street elbow - Wikipedia

   en.wikipedia.org/wiki/Street_elbow

   Street elbows are available with bend angles of 90°, 45°, and 22.5°. They can be used in many plumbing applications, including water supply, drainage, sewers, vents, central vacuum systems, compressed air and gas lines, heating and air conditioning, sump pump drains, and other locations where plumbing fittings would be used to join sections of pipe.

4. Degree of curvature - Wikipedia

   en.wikipedia.org/wiki/Degree_of_curvature

   The radius of such a curve is 5729.57795. If the chord definition is used, each 100-unit chord length will sweep 1 degree with a radius of 5729.651 units, and the chord of the whole curve will be slightly shorter than 600 units.

5. 3-inch/50-caliber gun - Wikipedia

   en.wikipedia.org/wiki/3-inch/50-caliber_gun

   The 3-inch/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).

6. 3-inch gun M1903 - Wikipedia

   en.wikipedia.org/wiki/3-inch_gun_M1903

   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 ...

7. HMS Vanguard (1909) - Wikipedia

   en.wikipedia.org/wiki/HMS_Vanguard_(1909)

   Vanguard, 1910 History United Kingdom Name Vanguard Ordered 6 February 1908 Builder Vickers, Barrow-in-Furness Laid down 2 April 1908 Launched 22 February 1909 Commissioned 1 March 1910 Fate Sunk by internal explosion at Scapa Flow, 9 July 1917 Notes Protected war grave General characteristics (as built) Class and type St Vincent -class dreadnought battleship Displacement 19,700 long tons ...