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Alfred Angas Scott (1875-1923) (sometimes 'Angus'), of Scott Motor Cycle Co and Scott Autocar Co, patented an early form of calliper brakes in 1897, a fully triangulated frame, rotary induction valves, unit construction, and more.
1875 June 2nd. Baptised at Holy Trinity, Batley Carr Manningham, a mill town just north of Bradford to Ben Scott, a Stonemason and his wife Elizabeth
Scott's family moved to Scotland and he went to school at Melrose on the Scottish border near Selkirk.
Family later moved to Uttoxeter in Staffordshire where Alfred studied engineering and design at Abbotsholme School.
Trained in engineering at shipbuilders Douglas and Grant in Kirkcaldy
Worked at W. Sisson and Co in Gloucester, where he learnt to design and develop marine engines.
1900 He had started making engines for boats
1904 Patent GB 3367 for an engine
1908 He made his first motorcycle with a 450 cc two-stroke twin cylinder engine and two speed gearbox mounted in a triangulated frame. He is credited with the invention of the kick start.
1908 Founder of the Scott Motor Cycle Co
1911 Living at Marchfield, Wilmer Drive, Bradford: Herbert Scott (age 46 born Bradford), a Stuff Manufacturer and Employer. With his wife Alice Scott (age 38 born Paris) and their children Violet C. Scott (age 13 born Bradford), Maisie R. Scott (age 8 born Bradford), and Harold K. Scott (age 6 born Bradford). Also a guest Alfred A. Scott (age 36 born Bradford), an Engineer, Motor Cycles and Employer. Two servants.
1912 Listed as 'Scott, Alfred, Mech. Engineer, 6 Spring Gardens'.
1915 Joined the Scott Autocar Co
1923 August 11th. Aged forty-eight, died of pneumonia.
1924 Concerning his estate. '...the estate of Alfred Angas Scott, late of 6, Spring Gardens-road, Heaton, Bradford, Engineer, deceased (who died on the 11th August, 1923, and to whose estate letters of administration were granted by the Wakefield Registry to Herbert Scott, one of the next-of-kin...'
1923 Obituary 
"The death is announced of Mr. Alfred Angus Scott as having taken place on the 11th inst. Mr. Scott founded the Scott Engineering Co, of Bradford, which was afterwards transferred to Saltaire and made into the Scott Motor Cycle Co. Later he started the Scott Autocar Co at Lidget Green to make the Scott Sociable car. In 1915 he devised a machine gun attachment for a motor cycle and gave a demonstration with it in Buckingham Palace grounds. He early adopted the two-stroke engine for launch driving on the Clyde. Diagrams taken at the time from a two-cylinder 4in. by 4in. engine of his showed man pressures from 50 lb. to 65 lb. per square inch, at about 800 revolutions. Later, in his cycle engines, he got considerably higher pressures, particularly on those fitted with a rotary inlet valve. His machines won many prizes. He was a great advocate of the two-stroke system for motor cycling, and he himself won the Isle of Man Tourist Trophy Race in 1912 and 1913 on machines embodying his own inventions."