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Cyril John Lyth (c1891-1950)
1951 Obituary 
"CYRIL JOHN LYTH, M.SC., was educated at Coventry School and at the University of Birmingham, where he was awarded the Bowen Research Scholarship in engineering, and graduated B.Sc. with honours. Later he proceeded to the degree of M.Sc. After some experience as engineering assistant to Professor F. C. Lea (Past-President of the Institution) and as lecturer in engineering of Birmingham University he became an Aeronautical Inspection Directorate examiner, being made subsequently chief examiner and finally assistant inspector. While holding this appointment he was accorded the rank of honorary lieutenant, R.A.F. On the conclusion of a five years' engagement as chief inspector to the Birmingham Small Arms Company (Tools), Ltd., in 1925, he began a connection with Messrs. J. Stone and Company, Ltd., engineers, of Deptford, which lasted until his death in his fifty-ninth year on 27th June 1950.
His first appointment was that of assistant works manager and six years later he became manager of the marine department. In 1934 he transferred to the firm's works at Charlton on taking over the duties of deputy works manager there. His next position, which he held from 1943, was that of works manager at Deptford, where he had the charge of 1,800 employees. Finally, he took charge of the development and manufacture of controllable pitch propellers. Mr. Lyth was elected an Associate Member of the Institution in 1919, and transferred to Membership in 1943."