The chicago type writer is not british.
The inventor of the Thompson submachine gun was Kentucky-born Army officer John Taliafeffo Thompson. He was born into a military family, and spent his youth on military bases across the United States. He graduated from the military academy West Point in 1882 and then entered the army. By 1890 Thompson was working in the Ordnance Department, where he remained for the rest of his career. Thompson became a specialist in small arms, and by 1903 he was working on modernizing many of the Army's weapons designs. He developed a new model rifle based on the German Mauser in 1903, and in 1907 he was put in charge of small arms design, development, and production in the Ordnance Department in Washington. Thompson's dream was to convince the United States Army to adopt or develop an automatic rifle, but his ideas were considered radical. The machine gun's several inventors had all gone to Europe to market their weapons, and the U.S. Army remained uninterested. Thompson eventually retired from the army in 1914, and went to work for the Remington Arms Corporation, one of the leading American weapons manufacturers. At Remington he pursued plans to design his own automatic rifle. Through personal contacts, Thompson met business magnate Thomas Fortune Ryan, and the financier agreed to provide the inventor with capital. In 1916, Thompson launched a new company, the Auto-Ordnance Corporation, to develop, manufacture, and market a new automatic rifle. This firm, based in New York, contracted with a Cleveland machine-tool firm, Warner & Swasey, to build and test its prototypes. Auto-Ordnance's first attempts at an automatic rifle failed. In 1917, with the European countries engaged in trench warfare in World War I, John Thompson decided to opt for a new design entirely. This was to be a small, hand-held machine gun. The Maxims and other machine guns in use in World War I were large, relatively immobile weapons that were used primarily defensively. Thompson envisioned a gun of similar swift firepower, that soldiers could run with, and so use in offensive assaults.
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here is the research link
Tommy gun and it's origin
"I am ready to meet my Maker. Whether my Maker is prepared for the great ordeal of meeting me is another matter."
-- Winston Churchill