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A supplemental chamber or cartridge adapter is typically used for a shorter cartridge of reduced diameter. [1] A cartridge conversion sleeve may include a short barrel of reduced bore diameter. Shotgun conversion sleeves may be called subgauge inserts , subgauge tubes , or gauge reducers .
This measurement comes from the time when early cannons were designated in a similar manner—a "12 pounder" would be a cannon that fired a 12-pound (5.4 kg) cannonball; inversely, an individual "12-gauge" shot would in fact be a 1 ⁄ 12 pounder. Thus, a 10-gauge shotgun has a larger-diameter barrel than a 12-gauge shotgun, which has a larger ...
Examples of adapters include one end BSP threaded with the other NPT threaded, and one end threaded with the other a plain socket for brazing. A coupling whose ends use the same connection method but are of different sizes is called a reducing coupling or reducer. An example is a 3/4" NPT to 1/2" NPT coupling.
[3] [4] During the same timeframe, Gilbert Equipment Co. tried to bring a semi-automatic version of the USAS-12 to the U.S. market, but Treasury Secretary Lloyd Bentsen classified this firearm as "having no sporting purpose", so it became a "destructive device" under the U.S. National Firearms Act of 1934. [5] This greatly restricted its ...
The diagram from Beard's 1897 coupler patent [1]. Janney couplers were first patented in 1873 by Eli H. Janney (U.S. patent 138,405). [2] [3] Andrew Jackson Beard was amongst various inventors that made a multitude of improvements to the knuckle coupler; [1] Beard's patents were U.S. patent 594,059 granted 23 November 1897, which then sold for approximately $50,000, and U.S. patent 624,901 ...
The size of the lead shot that is produced is determined by the diameter of the orifice used to drip the lead, ranging from approximately 0.018 inches (0.46 mm) for #9 lead shot to about 0.025 inches (0.64 mm) for #6 or #7.0 shot, while also depending on the specific lead alloy that is used.
Narrow gauge flat wagons, 750 mm (2 ft 5 + 1 ⁄ 2 in).Note the single buffer with a hook on the right side and a chain on the other. On some narrow-gauge lines in Europe, and on the Paris Metro, a simplified version of the loose-coupler is used, consisting of a single central buffer with a chain underneath.
English couplers on 1,676 mm (5 ft 6 in) and on 1,435 mm (4 ft 8 + 1 ⁄ 2 in) standard gauge [7] AAR couplers on 1,000 mm (3 ft 3 + 3 ⁄ 8 in) metre gauge [7] and some passenger (FIAT 7131 DMUs) and freight rolling stock on standard and broad gauge. Small knuckle coupler with slot in knuckle for link and pin couplers on 750 mm (2 ft 5 + 1 ...
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