Physics students at the University of California watched with amazement the antics of a gas flame in a glass tube on Dr. E. E. Hall's lecture desk. Near the tube was a radio transmitter. No one tampered with the gas supply, yet the gas flame was made to flare up, turn from yellow to blue and roar. Dr. Hall explained that seven miles away, in the General Electric Co.'s laboratory, Charles Kellogg, famed "bird man," was broadcasting notes from the phenomenal upper register of his voice. The vibrations, 15,000 to 20,000 per second, transmitted by radio, affected the gas flame as...
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