High Quality Content by WIKIPEDIA articles! Ward Leonard Control, also known as the Ward Leonard Drive System, was a widely used DC motor speed control system introduced by Harry Ward Leonard in 1891. In early 1900s, the control system of Ward Leonard was adopted by the U.S. Navy and also used in passenger lift of large mines. It also provided a solution to a moving sidewalk at the Paris Exposition of 1900, where many others had failed to operate properly. An outstanding contribution to the war effort was with the use of Ward-Leonard Control systems in antiaircraft radars. Connected to “calculators/directors” the automatic tracking motion in two dimensions had to be extremely smooth and precise. MIT (Rad lab) selected Ward-Leonard to equip the famous radar SCR-584, ca. 1942.

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