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Further modifications of its burning rate were achieved by shaping the powder grains into prismatic shapes, typically single-perforated hexagonal or octagonal prisms. They became obsolete as a propellant due to the introduction of nitro-explosive propellants such as Poudre B , in France, and later by Nobel's ballistite and, in Britain, by cordite .
In the crucial 1868 comparative tests, the 24 cm RK L/20 was only able to beat the British muzzleloading 9-inch Armstrong Gun after it started to use prismatic gunpowder. The first approved type of Prismatic Powder had a density of 1.66 and was known as P.P. C/68, approved in November 1868. [7]
When the C/86 was designed, the introduction of smokeless powder was still a few years in the future. Therefore, in 1890, the charge was 100 kg of brown prismatic powder. This gave the 215 kg steel grenade an initial velocity of 610 m/s. [21] By the mid 1890s, the charge of the C/86 was only 48 kg of 'Ammon Kuchen Pulver'. [22]
Next, two shots were fired from each of the 6-inch breechloaders. Next the two 12-inch guns in the front turret were tested. Each gun fired four regular grenades of 714 pounds (324 kg) with a reduced charge of 221.5 pounds (100.5 kg) and then six more with a full charge of 295 pounds (134 kg) of brown prismatic powder.
With a charge of 3.1 kg of prismatic powder, and a projectile of 14 kg, the average velocity was 469.1 m/s at 50 meters from the muzzle with a pressure of 1,900 atm. With 3.3 kg of another kind of gunpowder it was 466.1 m/s and a pressure of 1,383 atm. The first kind of powder gave the highest velocity. [26]
Rosemary Oil. A very common oil included in natural hair growth products, studies have noted the efficacy of rosemary in promoting hair growth. In one study, results showed that rosemary oil may ...
Tungsten carbide (chemical formula: WC) is a chemical compound (specifically, a carbide) containing equal parts of tungsten and carbon atoms. In its most basic form, tungsten carbide is a fine gray powder, but it can be pressed and formed into shapes through sintering [7] for use in industrial machinery,engineering facility,mold industry,cutting tools, chisels, abrasives, armor-piercing ...
3. Cuisine Adventures Puff Pastry Bites. $11.99 for 48 pieces. Hot little fingers foods are always welcome at a holiday party. This box has bite-sized puff pastry bites in four flavors: roasted ...
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