1861 – Born in Michigan. American electrical engineer.
1873-1879 – Showed marked inclination for mechanics early and under the adverse conditions of a new country, where machine shops and technical schools were unknown, made numerous mechanical devices, among them being a small steam engine at twelve; a full sized working bicycle at seventeen and a complete miniature working locomotive at eighteen.
1884-1887 – Spent vacations when in school at practical engineering work, and graduated from Hillsdale College with the degree of B.S. and M.S.
1895 – Organized the Arnold Company, one of the most successful engineering organizations in the United States, carrying on engineering and construction work for many leading steam railways and industrial concerns throughout the country.
1896 – He developed and took the responsibility of first applying the rotary converter sub-station storage battery high tension system of electric railway, by utilizing it on the Chicago & Milwaukee Electric road.
1900 – Was a delegate from the Institute to International Electrical Congress, Paris.
1902 – The city of Chicago selected him to make a thorough study and report of its traction system.
1903-1904 – He was the President American Institute Electrical Engineers.
1911 – Became a honorary Doctor Engineering, University of Nebraska.
– He submitted complete plans for a comprehensive subway system to the City Council Local Transportation Committee.