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The Adams Manufacturing Co was an English automobile manufacturer in Bedford between 1905 and 1914.
Hewitt returned to the United States to manufacture similar cars under his own name
c.1900 Arthur Henry Adams, an American electrical engineer, went into business on his own account
Hewitt designed a "gas buggy" along the lines of an Oldsmobile; this machine was built by the Adams Manufacturing Company.
1904 James Marshall Strachan was appointed works manager
1906 Produced a single-cylinder 9-10 h.p. car with single chain-drive branded as Adams-Hewitt. 
More conventional shaft-driven cars with vertical engines were produced as Adams.
1906 April. Details of the sixteen-cylinder petrol engine.
The Adams had a supposedly foolproof epicyclic transmission with a 10 hp single-cylinder engine
1907 October. Details of the 10-hp car.
Models offered included two- and four-cylinder cars and one of the first British V-8s; this had a 35/40 hp engine based on the French Antoinette model (an aero engine for which Adams were agents). But the V-8 was plagued by crankshaft breakages.
1908 November. Details of the 14-16-hp car shown at Olympia.
1909 March. Description and images of the 14-16hp model.
1909 November. Details of the 16-hp car.
In 1910, the company produced an advanced 16 hp model with front-wheel brakes; it came with compressed-air starting, tyre-inflating and jacking equipment. The "pedals-to-push" gear was still offered, as was a conventional four-speed transmission and an unusual planetary gear change (three-speed), which was operated by a pedal that moved in a gate.
1910 November. Details of the three-speed planetary gear.
1911 May. Details of the 16-20hp car.
1912 October. Details of the only model; 16-20hp.
1913 October. Details of the 10hp single-cylinder light car.
1914 The company closed.