What kind of rage, pain or pathology could have provoked Lee Harvey Oswald to such a dark deed? Most crime does not happen in a vacuum. They do not happen by blind chance - something causes them. Sometimes the reasons are social, sometimes psychological, most often both.
This article may need to be cleaned up. It has been merged from Radio History. Invention of radio The idea of wireless communication predates the discovery of "radio" with experiments in " wireless telegraphy " via inductive and capacitive induction and transmission through the ground, water, and even train tracks from the s on.
James Clerk Maxwell showed in theoretical and mathematical form in that electromagnetic waves could propagate through free space.
After the discovery of these "Hertzian waves" it would take almost 20 years for the term "radio" to be universally adopted for this type of electromagnetic radiation  many scientists and inventors experimented with wireless transmission, some trying to develop a system of communication, some intentionally using these new Hertzian waves, some not.
Over several years starting in the Italian inventor Guglielmo Marconi built the first complete, commercially successful wireless telegraphy system based on airborne Hertzian waves radio transmission. In an presentation, published inJames Clerk Maxwell proposed his theories and mathematical proofs on electromagnetism that showed that light and other phenomena were all types of electromagnetic waves propagating through free space.
Thus "wireless telegraphy" and radio wave-based systems can be attributed to multiple "inventors".
Development from a laboratory demonstration to a commercial entity spanned several decades and required the efforts of many practitioners. InDavid 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.
He demonstrated his discovery to the Royal Society inbut was told it was merely induction, and therefore abandoned further Radio three the essay. Thomas Edison came across the electromagnetic phenomenon while experimenting with a telegraph at Menlo Park.
He noted an unexplained transmission effect while experimenting with a telegraph. He referred to this as etheric force in an announcement on November 28, Edison would go on the next year to take out U. Patenton a system of electrical wireless communication between ships based on electrostatic coupling using the water and elevated terminals.
Although this was not a radio system the Marconi Company would purchase the rights in to protect them[ clarification needed ] legally from lawsuits.
Louis, Missouri and at the Franklin Institute in PhiladelphiaTesla proposed this wireless power technology could also incorporate a system for the telecommunication of information. In a lecture on the work of Hertz, shortly after his death, Professor Oliver Lodge and Alexander Muirhead demonstrated wireless signaling using Hertzian radio waves in the lecture theater of the Oxford University Museum of Natural History on August 14, During the demonstration a radio signal was sent from the neighboring Clarendon Laboratory building, and received by apparatus in the lecture theater.
Building on the work of Lodge,  the Indian Bengali physicist Jagadish Chandra Bose ignited gunpowder and rang a bell at a distance using millimeter range wavelength microwaves in a November public demonstration at the Town Hall of Kolkata.
Bose wrote in a Bengali essay, Adrisya Alok Invisible Light"The invisible light can easily pass through brick walls, buildings etc. Therefore, messages can be transmitted by means of it without the mediation of wires.
The Englishman 18 January quoted from the Electrician and commented as follows: Further refined as a lightning detectorit was presented to the Russian Physical and Chemical Society on May 7, An earlier description of the device was given by Dmitry Aleksandrovich Lachinov in July in the 2nd edition of his course "Fundamentals of Meteorology and climatology" — the first in Russia.
In the young Italian inventor Guglielmo Marconi began working on the idea of building a commercial wireless telegraphy system based on the use of Hertzian waves radio wavesa line of inquiry that he noted other inventors did not seem to be pursuing. Marconi raised the height of his antenna and hit upon the idea of grounding his transmitter and receiver.
With these improvements the system was capable of transmitting signals up to 2 miles 3. Marconi opened his "wireless" factory in the former silk -works at Hall Street, ChelmsfordEngland inemploying around 60 people. Shortly after the s, Marconi held the patent rights for radio. Marconi would go on to win the Nobel Prize in Physics in  and be more successful than any other inventor in his ability to commercialize radio and its associated equipment into a global business.
According to the newspaper Jornal do Comercio June 10,he conducted his first public experiment on June 3,in front of journalists and the General Consul of Great Britain, C. The points of transmission and reception were Alto de Santana and Paulista Avenue. It was described as "equipment for the purpose of phonetic transmissions through space, land and water elements at a distance with or without the use of wires.
Having few resources, he had to rely on friends to push his project. Despite great difficulty, three patents were awarded: On Christmas EveReginald Fessenden used a synchronous rotary-spark transmitter for the first radio program broadcast, from Ocean Bluff-Brant RockMassachusetts. Ships at sea heard a broadcast that included Fessenden playing O Holy Night on the violin and reading a passage from the Bible.Albrecht Dürer reference, including his biography, engravings, paintings, and drawings.
HISTORY OF THE OLD TIME RADIO Before Television, Radio was the dominant home entertainment medium. Old Time Radio (OTR) and the Golden Age of Radio refer to a period of radio programming in the United States lasting from the proliferation of radio broadcasting in the early s until television's replacement of radio as the dominant .
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