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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]
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 .
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]
N 2 is the maximum diameter (in case of cylindrical cells) or thickness (prismatic cells) in mm. N 3 is only used for prismatic cells to denote the maximum width in mm. N 4 is the maximum overall height in mm. (For any of the lengths above, if the dimension is smaller than 1 mm it can be written as tN, where N is tenths of mm)
Cobalt-chrome disc with dental bridges and crowns manufactured using WorkNC Dental Cobalt-chrome or cobalt-chromium ( CoCr ) is a metal alloy of cobalt and chromium . Cobalt-chrome has a very high specific strength and is commonly used in gas turbines , dental implants , and orthopedic implants .
A Canadian woman allegedly attempted to smuggle 22 pounds of methamphetamine wrapped as Christmas presents through a New Zealand airport on Sunday, Dec. 8. According to a news release from the New ...
Plus, having a buddy can keep you both accountable and make working out more fun. Day 4: Do some balance and stretching exercises, like yoga or barre, for around 30 minutes. Then do a half-hour of ...
The buzz generated by Cooper grew with every blocked shot, deft assist and thunderous dunk. Thousands of fans came from all across Maine to watch Nokomis in the state playoffs, COVID restrictions ...
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