Copyright 1996 IEEE. Reprinted with permission from the IEEE publication, “Scanning the Past” which covers a reprint of an article appearing in the Proceedings of the IEEE Vol. 84, No. 7, July 1996.
William Le Roy Emmet and Turboelectric Engineering
Sixty-five years ago, William Le Roy Emmet’s The Autobiography of an Engineer was published. The formal portrait of Emmet shown in Fig. 1 was included in the book. The book provided a fascinating personal account of his career of almost half a century devoted to electrical power engineering. In the preface, Emmet characterized engineering as a “thrilling profession to those who are suited to it, full of dangers, hopes, worries, and gratifications.” Later in the book, he attributed much of his success to “a definiteness of purpose backed by a dogged perseverance.” He added that “the important part of engineering is the detail and the good engineers are those who keep their eye close to it.” He mentioned that he had always had a keen interest in other areas than engineering including “literature, history, science, philosophy, music, and art in various forms.”
Fig. 1. Emmet at age 70, as painted by Ellen Emmet Rand in
1929. (Courtesy of The Autobiography of an Engineer, 1931.)
Emmet was born in New Rochelle, NY, in 1859. He graduated from the U.S. Naval Academy in 1881 [See Fig.2(a)] and served a tour on the U.S.S. Essex before leaving the Navy in 1883. His first experience in the field of electric power was gained with the United States illuminating Company which he left to join the Sprague Electric Railway and Motor Company in 1888. At Sprague, Emmet worked on the installation of electric street railway systems in several cities, including Cleveland, St. Louis, Wichita, and Harrisburg, PA. Subsequently, he worked briefly for the Westinghouse Electric and Manufacturing Company and for the Buffalo Railway Company before joining the Edison General Electric Company as district engineer in the Chicago district in 1891. When the General Electric Company (GE) was formed through a merger of Edison General Electric and Thomson-Houston, Emmet became a GE employee and was assigned to the Lighting Department in Schenectady, NY, in 1894.
Emmet made significant contributions to ac power systems including the design of large rotary converters which were used widely to convert transmitted ac power to direct current needed for the manufacture of aluminum, electric railways, and other applications. He was a leader in constructing the second largest power generating plant at Niagara Falls, NY, which used GE apparatus. His career was interrupted by the Spanish-American War when he served as a navigational officer on the collier Justin [See Fig. 2(b)]. When he returned to GE, he was assigned to help develop the steam turbine which began to supplant reciprocating steam engines in the power generating field in the first decade of the 20th Century. Emmet directed the construction and installation of a 5000 kW turboalternator at the Fisk Street power plant of the Chicago Edison Company in 1903.
Fig. 2. Emmet as a cadet in the U. S. Naval Academy in 1880.
Fig. 3. Emmet was back in uniform in 1898 as a Navigational Officer on the collier Justin during the Spanish-American War (Photos courtesy of The Autobiography of an Engineer, 1931.)
Fig. 4. The U.S.S. New Mexico was the first battleship to have Emmet’s turboelectric propulsion system installed
by GE under a 1915 Navy contract. Illustration courtesy of GE, 1920.
Emmet became a leading advocate of the electric propulsion of ships and his efforts led to a GE contract to equip the Navy collier Jupiter with turboelectric drive. The Jupiter proved quite successful during World War I and later was converted into an aircraft carrier and renamed the Langley. In 1915, GE received a contract to install the Emmet propulsion system on a new battleship, the New Mexico, as shown in Fig. 3 (known initially as the California). First tested in sea trials in 1918, the ship’s propulsion system could deliver up to 32,000 hp and achieve a speed of 21 kn. Subsequently, GE installed an even more powerful drive system in high speed battle cruisers known as the Saratoga and the Lexington. These ships, later converted to aircraft carriers, were designed with 180,000 hp turboalternator propulsion and a speed of 35 kn.
During World War I, Emmet served as a member of the Naval Consulting Board formed to provide expert advice on military innovations. He received the prestigious Edison Medal of the American Institute of Electrical Engineers in 1919 in recognition of his numerous contributions to electric power engineering including ship propulsion. He received the Elliott Cresson Medal of the Franklin Institute in 1920 and also was elected to the National Academy of Sciences.
Emmet devoted a great deal of time and energy to the development and promotion of mercury vapor turbines as a more efficient power generation system than steam turbines. A few mercury turbines were installed as a result of his efforts but the difficulties and risks in using the new technology led to termination of the development after his retirement. He died in 1941 at age 82.
James E. Brittain
School of History , Technology and Society
Georgia Institute of Technology