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In 1878, David E. Hughes noticed that sparks could be heard in a telephone receiver when experimenting with his carbon microphone. He developed this carbon-based detector further and eventually could detect signals over a few hundred yards.
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In 1888 Heinrich Rudolf Hertz was able to conclusively prove transmitted airborne electromagnetic waves in an experiment confirming James Maxwell's theory of electromagnetism. This was one of the first steps to creating the radio.
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Over several years starting in 1894 the Italian inventor Guglielmo Marconi built the first complete, commercially successful wireless telegraphy system based on airborne Hertzian waves. Over the years, people would build onto it, giving it clearer sound, more streamlined and handheld!
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In 1900, Brazilian priest Roberto Landell de Moura transmitted the human voice wirelessly. People could now use phones and radios without wires, allowing easier use.
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On Christmas Eve 1906, Reginald Fessenden used a synchronous rotary-spark transmitter for the first radio program broadcast, from Ocean Bluff-Brant Rock, Massachusetts. People could now hear broadcasts from all over the globe.
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In June 1912 Marconi opened the world's first purpose-built radio factory at New Street Works in Chelmsford, England.
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In 1954, the Regency company introduced a pocket transistor radio, the TR-1, powered by a "standard 22.5 V Battery." People could now bring radios anywhere they wanted.
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The People History -- Steve Pearson. (n.d.). Radio. Retrieved October 05, 2017, from http://www.thepeoplehistory.com/radio.html History of radio. (2017, October 04). Retrieved October 05, 2017, from https://en.wikipedia.org/wiki/History_of_radio Us, H. Q. (n.d.). Retrieved October 05, 2017, from http://www.techwholesale.com/history-of-the-radio.html (n.d.). Retrieved October 05, 2017, from http://www.personal.psu.edu/jtk187/art2/radio.htm
