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Alfred William Marshall (1865-1942)
Son of Alfred Marshall, publisher, and brother of Percival Marshall
1889 Started in business for himself as a mechanical engineer, in Soho London - A. W. Marshall and Co
1894 The business was amalgamated with that of the Crypto Works Co in which he obtained an interest.
Associate of Inst of Electrical Engineers
1900 Joined I Mech E
1943 Obituary 
ALFRED WILLIAM MARSHALL. whose death occurred at Croydon on 20th July 1942, was a well-known scientist and engineer and was the author of a number of books and articles on technical subjects. He was born in 1865 and on the completion of a five years' apprenticeship with Messrs. D. Napier and Son, marine engineers, of London, he went for a year to Messrs. Maudslay and Sons, as an improver, in 1886. After brief periods as draughtsman with Messrs. Nalder Brothers and Messrs. Henry Doulton and Company, sanitary engineers, of London, he became, in 1889, a partner and manager in the Crypto Works Company, Ltd., and retained this association for eleven years, when he severed his connection and entered into partnership with Messrs. Marshall and Woods, electrical engineers, of London.
From 1903 until his retirement, Mr. Marshall confined his activities to consulting work and contributions to the press on scientific and engineering subjects, in addition to being the author of several books. His work in connection with model engineering will be remembered by many. As an inventor, he designed and developed improvements for early electric motors, invented a safety catch for railway carriage doors, and the "Lupus" lamp, the first of which he fitted in the London Hospital at the request of Queen Alexandra. He was also keenly interested in early flying machines, giving much assistance with those of Sir Hiram Maxim; in addition, he was the author of a book "Flying Machines, Past, Present, and Future". He was keenly interested too, in marine engineering, and made a special study of torpedo gyroscopes, one of the early type being accepted from him by the Royal Navy.
Mr. Marshall had been a Member of the Institution since 1900, and was also a Member of the Institution of Electrical Engineers.