ADLER, CHARLES (1899–1980), U.S engineer and inventor. A life-long resident of Baltimore, Maryland, Adler began his career as an inventor at 14, receiving a patent on an electric automotive brake. After attending Johns Hopkins University, he served briefly in the army during World War I and in 1919 became associated with the Maryland and Pennsylvania Railroad. In 1928 he developed and installed the first traffic-actuated signal light (actuated by the sound of a car horn). In 1937 he became a consultant to the Baltimore and Ohio Railroad, continuing to invent safety and signal devices for automobiles, trains, and aircraft. He was granted over 60 U.S. patents for devices in general use. He was a member of the Maryland Traffic Safety Commission from 1952 until his death. (Bracha Rager (2nd ed.)

Encyclopedia Judaica. 1971.

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