William Le Roy Emmet was an American electrical engineer. 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. Emmet worked to equip battleships with turboelectric drives.
William Le Roy Emmet was born in New Rochelle, NY, on July 10, 1859. He graduated from the U.S. Naval Academy in 1881. Emmet served during the Spanish-American War (1898) as a navigational officer on the collier Justin and during World War I as a member of the Naval Consulting Board formed to provide expert advice on military innovations. William Le Roy Emmet leaved 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 ElectricRailway and Motor Company in 1888.
At Sprague, Emmet worked on the installation of electric street railwaysystems 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 RailwayCompany, 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 was moved to Schenectady, New York, where he spent the rest of his career. Emmet became a GE employee and was assigned to the Lighting Department in Schenectady, NY, in 1894.
Hydroelectric Generating Plant, 1895
Emmet began working with Charles Curtis and the steam turbine around 1901 and is credited with making Curtis’ ideas work in the production of electricity. 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.
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 twentieth 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.
Aircraft carrier the Langley
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, 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 knots. Subsequently, GE installed an even more powerful drive system in high-speed battlecruisers 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 knots.
IEEE Edison Medal
William Le Roy Emmet received the prestigious Edison Medal of the American Institute of Electrical Engineers in 1919 in recognition of his numerous contributions 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 Sciences.
Emmet published “The Autobiography of an Engineer” in 1931. The book provided a 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.”
Emmet devoted a great deal of time and energy to the development and promotion of mercury vapor turbine, “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 retirement. He died in Erie, Pennsylvania, on September 26, 1941, at age 82.