Radio: The Past and The Present
Radio: The Past and The Present
In the early days, about a century ago, there was few ways of mass communication. The only real source of mass communication was print. Every town or city had a local newspaper where all the information was released to everyone. But then there was a new invention, radio. Radio was an extremely influential part of everyday life, and still is in the 21st century. Most people credit the invention of radio to a man named Guglielmo Marconi. Although there were many people that contributed to the invention, he was the first man to actually find out how to broadcast sound waves and succeed. In 1902, Marconi held a lecture for the Society of Arts, which is where he discussed his technique that he called “Syntonic Wireless Telegraphy.” This is his theory of his states: "It is desirable that the induction coil should be in tune or syntony with the electrical oscillations transmitted, the most appropriate number of turns and most appropriate thickness of wire varying with the length of wave transmitted.” This is a quote that was made from Marconi in the early 1900’s.
This is a timeline explaining all of the events that led up to the invention of radio. All of these occurrences are ones that helped in Marconi’s invention of one of the greatest mass communication devices, the radio.
1831 - Michael Faraday discovered the principle of electro-magnetic induction.
1842 - Joseph Henry discovers that an electrical spark between two conductors is able to induce magnetism in needles; this effect is detected at a distance of 30 meters.
1858 - Feddersen proves with his experiments the oscillating character of spark-discharges.
1867 - James Clerk Maxwell developed his theory on electro-magnetism and predicted the existence of electrical waves in the aether.
1870 - Von Bezold discovered interference with capacitor-discharges.
1879 - David E. Hughes discovered that a tube of iron filings becomes conductive by action at distance by electrical sparks, he makes a signal audible on a headphone on a distance of 500 meters, he stopped his experiments when Sir George Stokes professed that the appearances concerned just ordinary induction, he did not publish about his discovery.
1882 - Graham Bell en William H. Preece transmit signals across sea by means of induction, between England and the Isle Wight, at heat moment of a cable disorder. This system of Wireless Telegraphy does not develop on a large scale; the system...