Radio: the application of electromagnetic radiation

      Last time, we talk to the part that Hertz observed the electromagnetic radiation and made a conclusion that light is a kind of electromagnetic radiation. Although Hertz is the first man who observed electromagnetic radiation, he didn't concentrate on the application on electromagnetic radiation. Hertz even said that "It's of no use whatsoever, this is just an experiment that proves Maestro Maxwell was right." Now, radio is using all over the world, it's because two man who devoted in developed the wireless communication.

Guglielmo Marconi

(https://upload.wikimedia.org/wikipedia/commons/thumb/0/0d/Guglielmo_Marconi.jpg/220px-Guglielmo_Marconi.jpg)

      A.D.1864, Guglielmo Marconi transported the electromagnetic radiation in the distance of few centimeter. 1896, Marconi got the patent right of radio in England. After a year, Marconi founded a company of radio transmission, it will become the famous company "Marconi Company" in future.

Nikola Tesla

(https://upload.wikimedia.org/wikipedia/commons/thumb/d/d4/N.Tesla.JPG/220px-N.Tesla.JPG)

      A.D.1893, Nikola Tesla displayed wireless communication to public. 7 years later, Tesla got the patent right of radio in USA. However, USA cancelled the patent right of Tesla and gave it to Marconi in 1904. Nikola Tesla pasted away with the sorrow about radio's patent right in January 7, 1943.

Nicola Tesla's patent right of radio transmission

(https://i1.read01.com/image.php?url=0CzhHO0B)

June 21, 1943, USA gave the patent right of radio back to Tesla. But some scholar think the reason is not because USA really think Tesla is the first man who create wireless communication, the truth is USA didn't want to pay the huge amount of money to Marconi Company because of using radio during WW1.

      By the way, Guglielmo Marconi got the Nobel Prize in Physic in 1909.