The Italian Guglielmo Marconi (1874-1937) was one of the most important inventors in regards to radio transmissions. His work laid the foundation for modern wireless communication.
In 1895 at only 21 years old, with relatively modest equipment he was already capable to transmitting signals over 1.5 mi (2.4km). He then wrote to the Minister of Post and Telegraphs to receive more funding. Not only did the Minister ignore his request, he event thought Marconi was “ready for the insane asylum”.
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Photo Credits / Sources:
By Unidentified photographer. Smithsonian Institution from United States [No restrictions], via Wikimedia Commons