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Reels of up to 7 inches (18 cm) in diameter, most commonly with plastic flanges but metal was also used, which fit over a splined 1 ⁄ 4 in (6.4 mm) shaft. These reels dominated domestic applications. The most common sizes were seven, five and three inches (17.8, 12.7 and 7.6 cm) in diameter. In each case the shaft or hub had three splines.
12 ft. Metric ( SI) units. 25.4 mm. A fire hydrant marked as 3-inch. The inch (symbol: in or ″) is a unit of length in the British Imperial and the United States customary systems of measurement. It is equal to 1 36 yard or 1 12 of a foot. Derived from the Roman uncia ("twelfth"), the word inch is also sometimes used to ...
2.54 cm — 1 inch; 3.1 cm — 1 attoparsec (10 −18 parsecs) 3.5 cm — width of film commonly used in motion pictures and still photography; 4.3 cm — minimum diameter of a golf ball [32] 7.3-7.5 cm — diameter of a baseball [33] 8.6 cm × 5.4 cm — dimensions of a typical credit card [34]
In digital photography, the image sensor format is the shape and size of the image sensor . The image sensor format of a digital camera determines the angle of view of a particular lens when used with a particular sensor. Because the image sensors in many digital cameras are smaller than the 24 mm × 36 mm image area of full-frame 35 mm cameras ...
780 m/s (2,600 ft/s) APCBC. 930 m/s (3,100 ft/s) APCR. Maximum firing range. 10,500 m (34,449 ft) The 8.8 cm KwK 36 ( German: 8,8 cm Kampfwagenkanone 36) was an 88-millimetre (3.5 in) tank gun used by the German Army during World War II. This was the primary armament of the PzKpfw VI Tiger I tank. It was developed and built by Krupp .
The name of the gun applies to a series of related guns, the first one officially called the 8.8 cm Flak 18, the improved 8.8 cm Flak 36, and later the 8.8 cm Flak 37. [N 2] Flak is a contraction of German Flugabwehrkanone (also referred to as Fliegerabwehrkanone) [11] [N 3] meaning "aircraft-defense cannon", the original purpose of the weapon.
The 3.7 cm Flak 18/36/37 was a series of anti-aircraft guns produced by Nazi Germany that saw widespread service in the Second World War. The cannon was fully automatic and effective against aircraft flying at altitudes up to 4,200 m. [ 4] The cannon was produced in both towed and self-propelled versions.
The QF 3.7-inch AA was Britain's primary heavy anti-aircraft gun during World War II. It was roughly the equivalent of the German Flak 8.8 cm and American 90 mm, but with a slightly larger calibre of 3.7 inches, approximately 94 mm. Production began in 1937 and it was used throughout World War II in all theatres except the Eastern Front.