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Many people were involved in the invention of radio in its current form. Experimental work on the connection between electricity and magnetism began around 1820 with the work of Hans Christian Ørsted, and continued with the work of André-Marie Ampère, Joseph Henry, and Michael Faraday. These investigations culminated in a theory of electromagnetism developed byJames Clerk Maxwell, which predicted the existence of electromagnetic waves.How can they teach History when the text books are basically fantasy? Publishers print what they know will sell, not was is factual. We were taught Marconi discovered radio frequency, when Telsa was responsible and there was a Supreme Court ruling to the fact. Yet teachers taught it was Marconi. One example of how slanted things can become and are perpetuated.
Many people were involved in the invention of radio in its current form. Experimental work on the connection between electricity and magnetism began around 1820 with the work of Hans Christian Ørsted, and continued with the work of André-Marie Ampère, Joseph Henry, and Michael Faraday. These investigations culminated in a theory of electromagnetism developed byJames Clerk Maxwell, which predicted the existence of electromagnetic waves.How can they teach History when the text books are basically fantasy? Publishers print what they know will sell, not was is factual. We were taught Marconi discovered radio frequency, when Telsa was responsible and there was a Supreme Court ruling to the fact. Yet teachers taught it was Marconi. One example of how slanted things can become and are perpetuated.
Maxwell published A Treatise on Electricity and Magnetism in 1873, stimulating many people to experiment with wireless communication. Others experimented without the benefit of his theories. It is considered likely that the first intentional transmission of a signal by means of electromagnetic waves was performed by David Edward Hughes around 1880, although this was considered to be induction at the time. The first systematic and unequivocal transmission of EM waves was performed by Heinrich Rudolf Hertz and described in papers published in 1887 and 1890. Hertz famously considered these results as being of little practical value.
After Hertz's work many people were involved in further development of the electronic components and methods to improve the transmission and detection of electromagnetic waves. Around the turn of the 20th century Guglielmo Marconi, developed the first apparatus for long distance radio communication.[1] On 23 December 1900, Reginald A. Fessenden became the first person to send audio (wireless telephony) by means of electromagnetic waves, successfully transmitting over a distance of about 1.6 kilometers, and six years later on Christmas Eve1906 he became the first person to make a public radio broadcast.[2][3]
Invention of radio - Wikipedia, the free encyclopedia
Tesla[edit]
In the early 1890s Nikola Tesla began research into high frequency electricity. During his visit to the Paris Exposition Universelle in 1889 Tesla learned of Hertz's experiments with electromagnetic waves using coils and spark gaps and proceeded to duplicate those experiments.[60][61] Tesla came to the incorrect[62] conclusion that Maxwell, Lodge, and Hertz were wrong in their findings that airborne electromagnetic waves (radio waves) were being transmitted and instead attributed it to what he called “electrostatic thrusts”,[63] with the real signals being conducted by Earth currents.[64]
In 1891 he developed various alternator apparatus that produced 15,000 cycles per second and developed his own very large air-gapped coil, known now as a Tesla coil.[65][66] Tesla's primary interest in wireless phenomenon was as a power distribution system.[67] By 1892 he was delivering lectures on high potential/high frequency alternate currents"[68] and went on to demonstrate "wireless lighting"[63] in 1893[69] including lighting Geissler tubes wirelessly. Tesla proposed this wireless technology could be developed into a system for the telecommunication of information.[citation needed]
How can they teach History when the text books are basically fantasy? Publishers print what they know will sell, not was is factual. We were taught Marconi discovered radio frequency, when Telsa was responsible and there was a Supreme Court ruling to the fact. Yet teachers taught it was Marconi. One example of how slanted things can become and are perpetuated.
Were you really taught history in school or were you simply "spoon fed" what the government wanted you to be taught? Has Hollywood movies actually portrayed slavery in the correct light of actual historical facts?
Didn't Know Blacks Owned Slaves in America? You Were Taught History... ⋆ Joe For America
Were you really taught history in school or were you simply "spoon fed" what the government wanted you to be taught? Has Hollywood movies actually portrayed slavery in the correct light of actual historical facts?
Indeed, much of history is Euro-centric which should not be surprising given that 4 of the 6 inhabited continents are populated and dominated largely by those of European descent and all cultures teach their own history more than that of others.Were you really taught history in school or were you simply "spoon fed" what the government wanted you to be taught? Has Hollywood movies actually portrayed slavery in the correct light of actual historical facts?
Didn't Know Blacks Owned Slaves in America? You Were Taught History... ⋆ Joe For America
I was taught Euro-centric Imperialist-slanted history.
Were you really taught history in school...
... I know a woman whose Irish grandmother, in the 1950s, still referred to Christianism [sic] as “the new religion,” ...
FFS, try to show a sphere on a flat surface and see what you come up with. The best you can do on relative size is a series of elongated footballs meeting only at the equator. Don't be such a vacuous hack!Very maps used (Mercator) convey Eurocentric-thinking. They're in no way accurate to what you'd see from orbit and marginalize, distort, and misrepresent reality. Greenland and Africa are shown as roughly the same size despite Africa being 14 times the area of Greenland. So when discussing things like enviromental protection, one might think they're both about equal in terms of enviromental significance yet Africa's 14 times as significant as Greenland.
FFS, try to show a sphere on a flat surface and see what you come up with. The best you can do on relative size is a series of elongated footballs meeting only at the equator. Don't be such a vacuous hack!Very maps used (Mercator) convey Eurocentric-thinking. They're in no way accurate to what you'd see from orbit and marginalize, distort, and misrepresent reality. Greenland and Africa are shown as roughly the same size despite Africa being 14 times the area of Greenland. So when discussing things like enviromental protection, one might think they're both about equal in terms of enviromental significance yet Africa's 14 times as significant as Greenland.
