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Leslie Haywood Hounsfield (1877-1957), Managing Director of Trojan
1877 Born at Oxhey Hall near Watford, Hertfordshire.
1904 He founded Polygon Engineering when aged 27, the name coming from the address of the premises, 65a The Polygon, Old Clapham Town, South London.
His first car was registered in 1913, it ran on solid tyres (which most manufacturers had abandoned at the turn of the century). Hounsfield proclaimed that his engines had just seven moving parts (four pistons, two con rods and one crankshaft).
In 1914 he moved to Vicarage Road, Croydon where a second prototype was built. The business was renamed Trojan in 1914 but he lacked the capital to start production.
In April 1920 Trojan advertised that they were prepared to enter a licensing arrangement and by June were talking to Leyland Motors. A deal was made in 1921 for Leyland to make the Trojan car, paying a royalty of £5 for each car. Production was slow during 1922 but picked up in 1923 and around 17,000 were built altogether.
In August 1923 Hounsfield retired as managing director and became Leyland's chief engineer in their Trojan Department.
In late 1928 Leyland gave the company notice to quit their works, followed by the cancellation of the licensing agreement early the next year. A large part of 1929 was therefore spent in moving production to Purley Way.
Commercial vehicle production restarted in 1948 and ceased in 1964.
During his time a Trojan, Leslie Hounsfield had patented a folding spring-frame camp bed, which was made in the Trojan factory.
In 1933, aged 56, he left Trojan to set up on his own as a small manufacturer making metal testing instruments as well as the camp bed. The business called Hounsfield lasted in to the 1950's.
Hounsfield died aged 80 on the 17th September 1957.
1959 Obituary 
Leslie Haywood Hounsfield, who was born in 1877, received his education at Brighton Grammar School and Battersea Polytechnic. He was apprenticed to James Simpson and Sons, Ltd. (later Worthington-Simpson, Ltd.), and in 1898 he obtained a Whitworth Exhibition and entered the Royal College of Science. His career was interrupted by service in the South African war; later he spent some time assisting Col. R. E. B. Crompton, and then with Ransomes, Sims and Jefferies, Ltd.
For many years he was engaged on research on internal-combustion engines, and was the designer of the 'Trojan' motor car. He was Managing Director of Trojan, Ltd., Croydon, for several years, and was at one time connected with Leyland Motors, Ltd. Mr. Hounsfield was responsible for 15 patents in connection with motor cars.
He held the post of Managing Director of Tensometer, Ltd., manufacturers of testing machines and equipment, in which branch of engineering science he spent much of his later life, and he was also Managing Director of Hounsfield, Ltd. He designed a whole range of portable machines for testing materials of all kinds.
Mr. Hounsfield served as President of the Institution of Automobile Engineers in 1928-29, on whose Council he served continuously for 40 years. He had a profound effect upon its educational policy and was awarded the Institution Medal in this connection. He worked selflessly in all areas of I.A.E. activity and fully lived out the message of his Presidential Address which he entitled 'The Integrity of the Technical Man'.
He was elected an Associate Member of the Institution of Mechanical Engineers in 1907, transferred to Member in 1914, and elected to Honorary Membership in 1947. He was also an Associate Member of the Institution of Civil Engineers.
His death occurred on 17th September 1957.