The Precipitron, an electrostatic air cleaner, was developed by Westinghouse in 1935. It came out of "a successful failure" in research, and a hopeful house-cleaning experiment in Pittsburgh. In 1929, a young research engineer named Penney, followed up on German experiments with ionized air and found a clue to cleaner air. With a wire, a couple of aluminum plates and a burning oily rag, he rigged his first crude electrostatic dirt trap. Into the Penney cellar went a home-size experimental Precipitron. Willing helpers in any attempt to lessen Pittsburgh grime were Mrs. Penney and daughter Marjorie Elizabeth, who became the first field-test observers. Quickly they found daily dustings were unnecessary—once a week was enough. Curtains which formerly turned dark in a few days stayed fresh for several months. At the end of two weeks, Engineer Penney filled a quart milk bottle with the black, powdery rubbish from the air. In the 1940s, the Precipitron was used in homes, offices, hospitals and factories, literally electrocuting dust and dirt out of the atmosphere. This was taken from the Westinghouse film 1943 Electronics At Work
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