Electric Eyes Gauge Speed of Baseball (Sep, 1939)
Electric Eyes Gauge Speed of Baseball
How fast can a baseball player throw a ball? A portable machine that answers this question was tried out recently at Cleveland, Ohio. Hurled into a tunnel, the ball cuts across two light beams aimed at photo-electric cells, and a mechanism registers the speed by a light flashed onto a vertical scale. Bob Feller, Cleveland pitcher, threw a ball at the rate of about seventy-five miles an hour in a test with the machine.