Ralph Teetor (1890-1982) was a prolific (and blind) inventor who invented cruise control. He was also the longtime president of the very successful automotive parts manufacturer The Perfect Circle Co. Corporation in Hagerstown, Indiana, a manufacturer of piston rings. He graduated from the University of Pennsylvania in 1912, which surprised the faculty because they originally thought that he couldn't do the required work.
Teetor's highly developed sense of touch proved its advantage in developing a technique for balancing steam turbine rotors used in torpedo-boat destroyers. Dynamic balancing of large components had puzzled others before Teetor solved the problem.
Teetor was inspired to invent cruise control one day while riding with his lawyer. The lawyer would slow down while talking and speed up while listening. This rocking motion so annoyed Teetor that he was determined to invent a speed control device.
http://en.wikipedia.org/wiki/Ralph_Teetor
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