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In structural engineering, Johnson's parabolic formula is an empirically based equation for calculating the critical buckling stress of a column. The formula is based on experimental results by J. B. Johnson from around 1900 as an alternative to Euler's critical load formula under low slenderness ratio (the ratio of radius of gyration to ...
Obturation in firearms and air guns is the result of a bullet or pellet expanding or upsetting to fit the bore, or, in the case of a firearm, of a brass case expanding to seal against the chamber at the moment of firing. In the first case, this both seals the bullet in the bore, and causes the bullet to engage the barrel's rifling. In the ...
This formula was derived in 1744 by the Swiss mathematician Leonhard Euler. [2] The column will remain straight for loads less than the critical load. The critical load is the greatest load that will not cause lateral deflection (buckling). For loads greater than the critical load, the column will deflect laterally.
Test barrel length: 610 millimetres (24 in) Source(s): Cartridges of the World , [ 1 ] Ammo Encyclopedia, [ 2 ] Kynoch [ 3 ] & Norma [ 4 ] The .404 Jeffery is a rifle cartridge designed for hunting large, dangerous game animals, such as the " Big Five " (elephant, rhino, cape buffalo, lion and leopard) of Africa. [ 5 ]
O ratio is also used to predict barrel life in cartridges of the same caliber, but not of different calibres, since the ratio is an extensive quantity that does not correlate to temperature or pressure (e.g. a .50 cal straight cartridge may have the same overbore as a highly necked down .17 cal cartridge).
Early .577 Snider cartridges were made from a composite design using paper and brass foil with a stamped metallic base and primer, much like the first generation of Martini-Henry cartridges. Later cartridges (after the design had been proved with the Martini-Henry cartridges) were made from drawn brass, much like modern small arms ammunition.
The .35 Winchester / 9.1x61mmR (colloquially .35 Win) cartridge was created in 1903 by the Winchester Repeating Arms Company for use in the Winchester Model 1895 lever-action rifle, [1] and was also available in the bolt action Remington-Lee, [2] or the Model 1905-E and 1905-R Factory Sporter Ross Rifle in Canada.
The carbine used a special brass cartridge which was also invented by Burnside. This cartridge contained a bullet and powder, but no primer; Burnside considered primed cartridges a safety risk. Pressing the weapon's two trigger guards opened the breech block and allowed the user to insert a cartridge.