Answer:
Ralph Teetor
Explanation:
Teetor became blind at age five in an accident, but as a grown man he preferred never to discuss his disability. He graduated from the University of Pennsylvania with a degree in mechanical engineering in 1912.
Teetor's highly developed sense of touch proved helpful in developing a technique for balancing steam turbine rotors used in Navy torpedo-boat destroyers. Dynamic balancing of large components had puzzled others before Teetor solved the problem.
