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quote:From "UNITED STATES EARLY RADIO HISTORY" BY THOMAS H. WHITERadio, currently a synonym for "electromagnetic radiation", actually first came into use before Heinrich Hertz's proof of the existence of radio waves. Originally "radio" was a general prefix meaning "radiant" or "radiation" -- hence the term "radio-activity" for the alpha, beta, and gamma rays emitted by decaying atoms. In Europe, some of the persons investigating Hertz's discovery began using the "radio-" prefix -- for example, in 1890 Edouard Branly in France called his receiver a "radio-conductor", the October 24, 1902 issue of The Electrician (London) included an article titled "The Radio-telegraphic Expedition of the H.I.M.S. 'Carlo Alberto'", and a report in the November 19, 1904 Electrical Review about Belgium marine applications noted that "radio-telegraphy has entered into the domain of current practice".