Clarence Floyd Hirshfeld

Clarence Floyd Hirshfeld (January 30, 1881 – April 19, 1939) was an American electrical, mechanical and consulting engineer, educator, chief of research for the Detroit Edison Co., now DTE Electric Company, author, and inventor, who was awarded the John Fritz Medal posthumously in 1940.

Biography Youth, education and early career Hirshfeld was born in San Francisco in 1881, son of Charles Hirshfeld and Lotta (McCarthy) Hirshfeld. He obtained his BSc in electrical engineering at the University of California in 1902, and later his MA in mechanical engineering from Cornell University in 1905.

At Cornell University Hirshfeld had started his career in 1903 as instructor at its Sibley College of Mechanical Engineering and Mechanic Arts, now Cornell University College of Engineering. There he served until 1914 working his way up to assistant professor and eventually Professor of mechanical engineering. In those days he had also started his own consultancy practice.

From 1932 to 1939, in the last seven years of his life, he directed development of PCC streetcar as chief engineer. In his days these form of transportation was introduced in cities, such as Toronto, Brooklyn, Pittsburgh, Washington, Baltimore, Chicago, San Diego and Los Angeles.

In 1932 Hirshfeld obtained his Doctorate in Engineering at Rensselaer Polytechnic Institute. In 1940, he was posthumously awarded the John Fritz Medal.

Selected publications Hirshfeld, Clarence Floyd, Engineering thermodynamics, New York, D. Van Nostrand company, 1910. Hirshfeld, Clarence Floyd and Tomlinson Carlile Ulbricht, Gas Paower. New York, Wiley, 1913. Hirshfeld, Clarence Floyd and Tomlinson Carlile Ulbricht, Steam power. New York, J. Wiley & sons, inc., 1916. Barnard, William Nichols, Frank Oakes Ellenwood, and Clarence Floyd Hirshfeld. Heat-power engineering. Volume 2. Wiley, 1935.

Articles, a selection

Hirshfeld, Clarence Floyd "Disturbing effects of horizontal acceleration." Electric Railway Presidents' Conference Committee, 1932. Hirshfeld, Clarence Floyd, and G. U. Moran. "Performance of Modern Steam-Generating Units." ASME Trans.(Fuels and Steam Power Section) 55 (1933): 117.

Patents, a selection Patent US1958577 - Apparatus for dust separation, 1934 Patent US2010668 - Tire for rail vehicles, 1935 Patent US2124350 - Wheel assembly, 1938 Patent US1923147 - Electric cable and method of operating the same, 1933 Patent US2207151 - Brake shoe, 1940 Patent US2243068 - Braking system, 1941