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Harry Sagar Hartley (1893-1949) of the Stirling Boiler Co
1949 Obituary 
WE have noted with regret the death on February 18th of Mr. Harry Sagar Hartley, who for the past twenty years was the deputy manager of the Stirling Boiler Company, Ltd., of London.
Mr. Hartley, who was born at Colne, Lancashire, in 1893, was educated at the Colne Secondary School, and he served his apprenticeship with the firm of E. A. Foulds and Co., engineers and millwrights at Colne.
On completing his practical training he joined the firm of Yates and Thom, Ltd., of Blackburn, as a draughtsman, and was engaged on the design of Corliss engines for mills and collieries.
He spent some time, too, with the Burnley Iron and Steel works, Ltd., on similar work.
Later he joined the firm of Peter Hooker, Ltd., which was then engaged on the manufacture of the Gnome aircraft engine, and in 1917 Mr. Hartley became chief draughtsman and designer and had charge of that work in connection with the building of the Gnome and Le Rhone aircraft engines.
In 1921 he was appointed chief designer at the Stirling Boiler Company, Ltd., London, a position he continued to hold until 1929, when he became assistant manager of the company.
He was a member of the Institution of Mechanical Engineers, a member of the Institute of Fuel, and a Fellow of the Royal Society of Arts. His death at the early age of fifty-five will be widely regretted by his many friends in the boiler engineering industry.
1950 Obituary 
"HARRY SAGAR HARTLEY, whose untimely death occurred on 18th February 1949, at the age of fifty-five, had been for the past twenty years deputy manager of the Stirling Boiler Company, Ltd., London.
He was educated at the Secondary School in his native town of Colne, Lanes, where he also served his apprenticeship with Messrs. E. A. Foulds and Company, engineers and millwrights, from 1908 to 1911.
On the completion of his practical training he joined the staff of Messrs. Yates and Thom, Ltd., as a draughtsman, and was engaged on the design of Corliss engines for mills and collieries. Subsequently he was employed on similar work by the Burnley Ironworks Co. In 1916 he transferred his services as draughtsman to Messrs. Peter Hooker, Ltd., who a year later placed him in charge of the drawing office with responsibility for the design of Gnome and Le Rhone aero-engines for the Royal Flying Corps. He remained with that firm until 1921 when he came to London to become chief draughtsman to the Stirling Boiler Co. He retained this position until, in 1929, he was promoted to the post of deputy manager. Mr. Hartley had been a Member of the Institution since 1940. He was also a Member of the Institute of Fuel and a Fellow of the Royal Society of Arts."