history & development of radio
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By: Jessa Anne BorreBSN-III
History & Development of Radio
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History of Radio
The history of radio can be traced through the lives of these people:
– Maxwell – Hertz – Marconi
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James Clerk Maxwell 1831-1879
Electric and MagneticTheory
• Theorized that light was an electromagnetic wave.
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Heinrich Hertz (1857-1894)
Experimentally verified Maxwell’s Theories.
Generated and propagated “radio waves ”
Built first transmitter, antenna, and receiver apparatus
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Guglielmo Marconi (1874-1937)
The italian “inventor of radio”. Improved and commercialized Hertz’
apparatus. Used for radio telegraphy
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1895: MARCONI'S INVENTION
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1895- sent and received his first radio signal in Italy
1899 - flashed the first wireless signal across the English Channel
This was the first successful transatlantic radiotelegraph message in 1902.
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Edwin H. Armstrong (1890-1954)
Inventor of the: – feedback amplifier – electronic oscillator – super-heterodyne receiver – FM radio
• His inventions allowed for the transmission of voice and music
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First portable radio
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Arthur Atwater Kent 1920
• Arthur Atwater Kent, Sr. (1873–1949) American inventor and prominent radio manufacturer based in Philadepia.
• In 1921, he patented the modern form of the automobile ignition coil.
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1921- produced his first radio components, selling the do-it-yourself kits consisting of "breadboards" that could be assembled by early radio enthusiasts.
In 1925, the Atwater Kent Manufacturing Company became the largest maker of radios in the United States.
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Leo Hendrik Baekeland 1935
a Belgian-born American chemist who Bakelite (1907), an inexpensive, nonflammable, versatile, and popular platic
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Table Radio 1955
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Hand held transistors 1962
Regency sony Emerson Zenith
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ITALY
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GEOGRAPHY
a long peninsula shaped like a boot, surrounded on the west by
Tyrrhenian Sea east by the Adriatic. bounded by France, Switzerland, Austria,
and Slovenia to the north.
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History
ANCIENT ITALY The Etruscans- First civilization in Italy 800bc
- influenced by the Greeks, with whom they traded.- 750 BC the Greeks established a colony on the
island of Ischia in the Bay of Naples. - founded colonies on mainland Italy such as
Reggio Calabria.
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March 17, 1861 - The Italy of modern time became a nation-state
Rome itself remained for a decade under the Papacy, and became part of the Kingdom of Italy only on September 20, 1870
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GOVERNMENT
Monarchy- 19th century
headed by a President who appoints a Prime Minister, the elected head of government.
1948- constitution established a bicameral parliament
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RELIGION
Italy is a Christian country
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CULTURE
well-known for its art, culture, and several monuments
food (pizza, pasta, etc.), wine, lifestyle, elegance, design, cinema, theatre, literature, poetry, visual arts, music (notably Opera), holidays, and generally speaking, for taste.
architecture contributed by giants such as Leonardo da Vinci, Raffaello, Botticelli, Fra Angelico, and Michelangelo.
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LANGUAGE
Italian language
BUONGIORNO! - Good Morning/Good Afternoon
BUONA GIORNATA - Have a Good Day BUONA SERA - Good Evening
BUONA NOTTE - Good Night CIAO - Goodbye
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LANDMARKS
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largest and most famous amphitheater in the Roman world.
80 entrances.
Spectators were protected from the rain and heat of the sun by sails called the “velarium”, that was attached around the top of the attic.
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Santa Maria del Fiore
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THANKYOU FOR LISTENING!!!