Maxim machine gun
The 19th century saw a revolution in firearms technology. Machine tools allowed for greater precision in gunsmithing. Misfires became less common with the introduction of the percussion cap and cartridge ammunition. Smokeless powder burned more cleanly and evenly than black powder, and gunsmiths were quick to realize the potential of utilizing a weapon’s recoil to increase its rate of fire. Hiram Maxim was the first inventor to incorporate all of these innovations into a single weapon. The Maxim gun,developed around 1884, was a recoil-operated, belt-fed, water-cooled machine gun that fired more than 500 rounds per minute at an effective range of more than 2,000 yards (1,830 meters). Maxim was an outspoken and effective advocate for his weapon, and armies across Europe adopted some version of the Maxim in the years before World War I. Versions of Maxim’s gun were ubiquitous on the Western Front; when matched against outdated infantry tactics, their killing power was astonishing. In just one day of the First Battle of the Somme, more than 20,000 British soldiers were killed in bloody and ineffective charges against entrenched German defenders armed with MG 08s—the German variant of the Maxim.

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發了三版了，越來越清楚，那就19號見吧！