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Gustave-Auguste Ferrié
Gustave-Auguste Ferrié (19 November 1868 – 16 February 1932) was a French radio pioneer and army general.Gustave-Auguste Ferrié Encyclopaedia Britannica Biography Early years Ferrié was born in , . After having studied in the southern city of , receiving the |
Saint-Michel-de-Maurienne
Saint-Michel-de-Maurienne (, literally ''Saint-Michel of Maurienne''; ) is a commune in the Savoie department in the Auvergne-Rhône-Alpes region in south-eastern France. Geography Climate Saint-Michel-de-Maurienne has an oceanic climate (Köppen climate classification ''Cfb''). The station is located at an altitude of ; due to its location on a leeward slope, there is significantly less precipitation than nearby areas. It is quite common to exceed in summer, sometimes the maximum temperature can reach , and in winter it is relatively rare to fall below . The average annual temperature in Saint-Michel-de-Maurienne is . The average annual rainfall is with December as the wettest month. The temperatures are highest on average in July, at around , and lowest in January, at around . The highest temperature ever recorded in Saint-Michel-de-Maurienne was on 19 August 2012; the coldest temperature ever recorded was on 5 February 2012. Population See also *Communes of the Savoi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wireless Telegraphy
Wireless telegraphy or radiotelegraphy is the transmission of text messages by radio waves, analogous to electrical telegraphy using electrical cable, cables. Before about 1910, the term ''wireless telegraphy'' was also used for other experimental technologies for transmitting telegraph signals without wires. In radiotelegraphy, information is transmitted by pulses of radio waves of two different lengths called "dots" and "dashes", which spell out text messages, usually in Morse code. In a manual system, the sending operator taps on a switch called a telegraph key which turns the transmitter on and off, producing the pulses of radio waves. At the radio receiver, receiver the pulses are audible in the receiver's speaker as beeps, which are translated back to text by an operator who knows Morse code. Radiotelegraphy was the first means of radio communication. The first practical radio transmitters and radio receiver, receivers invented in 1894–1895 by Guglielmo Marconi used radi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Henri Abraham
Henri Abraham (12 July 1868–22 December 1943) was a French physicist who made important contributions to the science of radio waves. He performed some of the first measurements of the propagation velocity of radio waves, helped develop France's first triode vacuum tube, and with Eugene Bloch invented the astable multivibrator. He was murdered at Auschwitz during the Holocaust. Life Henri Abraham was born on 12 July 1868 in the 1st arrondissement of Paris. After brilliant studies at Chaptal secondary school, from 1886 to 1889 he pursued scientific graduate studies at the École normale supérieure, where he attended the lectures of physics professors Jules Violle and Marcel Brillouin, and the Faculty of Paris, where he studied physics with Gabriel Lippmann and and obtained degrees in physical sciences and in mathematical sciences. He was then appointed for one year preparer physics laboratory of the École normale supérieure, then led by Jules Violle, where he wrote his t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paul Brenot
Paul Brenot (19 September 1880 – 19 August 1967) was a French engineer and industrialist who was active in the development of radio in France. He was an advocate of free enterprise and had corporatist opinions. He was criticized after World War II for working too closely with the German occupiers of France. Life Early years (1880–1918) Paul Brenot was born in Ruoms, Ardèche, on 19 September 1880. He joined the École Polytechnique in 1899. He graduated as an engineer, and from 1904 to 1919 collaborated with General Gustave-Auguste Ferrié in creating military radiotelegraphy. He was an important contributor to development of the Société française radio-électrique (SFR: French Radio Telephone Company) created in 1910 by Joseph Bethenod and Émile Girardeau. In 1910 Brenot was a pioneer in mounting a SFR radio set on a Blériot XI airplane. He was head of the wireless telegraphy (TSF: ''télégraphie sans fil'') service in the Ministry of Colonies from 1911 to 1919. Duri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Triode
A triode is an electronic amplifier, amplifying vacuum tube (or ''thermionic valve'' in British English) consisting of three electrodes inside an evacuated glass envelope: a heated Electrical filament, filament or cathode, a control grid, grid, and a Plate electrode, plate (anode). Developed from Lee De Forest's 1906 Audion, a partial vacuum tube that added a grid electrode to the thermionic diode (Fleming valve), the triode was the first practical electronic amplifier and the ancestor of other types of vacuum tubes such as the tetrode and pentode. Its invention helped make amplified radio technology and long-distance telephony possible. Triodes were widely used in consumer electronics devices such as radios and televisions until the 1970s, when transistors replaced them. Today, their main remaining use is in high-power Radio frequency, RF amplifiers in Transmitter, radio transmitters and industrial RF heating devices. In recent years there has been a resurgence in demand for ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amplifier
An amplifier, electronic amplifier or (informally) amp is an electronic device that can increase the magnitude of a signal (a time-varying voltage or current). It is a two-port electronic circuit that uses electric power from a power supply to increase the amplitude (magnitude of the voltage or current) of a signal applied to its input terminals, producing a proportionally greater amplitude signal at its output. The amount of amplification provided by an amplifier is measured by its gain: the ratio of output voltage, current, or power to input. An amplifier is defined as a circuit that has a power gain greater than one. An amplifier can be either a separate piece of equipment or an electrical circuit contained within another device. Amplification is fundamental to modern electronics, and amplifiers are widely used in almost all electronic equipment. Amplifiers can be categorized in different ways. One is by the frequency of the electronic signal being amplified. For ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radio Receiver
In radio communications, a radio receiver, also known as a receiver, a wireless, or simply a radio, is an electronic device that receives radio waves and converts the information carried by them to a usable form. It is used with an antenna. The antenna intercepts radio waves (electromagnetic waves of radio frequency) and converts them to tiny alternating currents which are applied to the receiver, and the receiver extracts the desired information. The receiver uses electronic filters to separate the desired radio frequency signal from all the other signals picked up by the antenna, an electronic amplifier to increase the power of the signal for further processing, and finally recovers the desired information through demodulation. Radio receivers are essential components of all systems based on radio technology. The information produced by the receiver may be in the form of sound, video (television), or digital data. A radio receiver may be a separate piece of electronic equ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vacuum Tube
A vacuum tube, electron tube, thermionic valve (British usage), or tube (North America) is a device that controls electric current flow in a high vacuum between electrodes to which an electric voltage, potential difference has been applied. It takes the form of an evacuated tubular envelope of glass or sometimes metal containing electrodes connected to external connection pins. The type known as a thermionic tube or thermionic valve utilizes thermionic emission of electrons from a hot cathode for fundamental Electronics, electronic functions such as signal amplifier, amplification and current Rectifier, rectification. Non-thermionic types such as vacuum phototubes achieve electron emission through the photoelectric effect, and are used for such purposes as the detection of light and measurement of its intensity. In both types the electrons are accelerated from the cathode to the anode by the electric field in the tube. The first, and simplest, vacuum tube, the diode or Flem ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
World War I
World War I or the First World War (28 July 1914 – 11 November 1918), also known as the Great War, was a World war, global conflict between two coalitions: the Allies of World War I, Allies (or Entente) and the Central Powers. Fighting took place mainly in European theatre of World War I, Europe and the Middle Eastern theatre of World War I, Middle East, as well as in parts of African theatre of World War I, Africa and the Asian and Pacific theatre of World War I, Asia-Pacific, and in Europe was characterised by trench warfare; the widespread use of Artillery of World War I, artillery, machine guns, and Chemical weapons in World War I, chemical weapons (gas); and the introductions of Tanks in World War I, tanks and Aviation in World War I, aircraft. World War I was one of the List of wars by death toll, deadliest conflicts in history, resulting in an estimated World War I casualties, 10 million military dead and more than 20 million wounded, plus some 10 million civilian de ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eiffel Tower
The Eiffel Tower ( ; ) is a wrought-iron lattice tower on the Champ de Mars in Paris, France. It is named after the engineer Gustave Eiffel, whose company designed and built the tower from 1887 to 1889. Locally nicknamed "''La dame de fer''" (French for "Iron Lady"), it was constructed as the centrepiece of the Exposition Universelle (1889), 1889 World's Fair, and to crown the centennial anniversary of the French Revolution. Although initially criticised by some of France's leading artists and intellectuals for its design, it has since become a global cultural icon of France and one of the most recognisable structures in the world. The tower received 5,889,000 visitors in 2022. The Eiffel Tower is the most visited monument with an entrance fee in the world: 6.91 million people ascended it in 2015. It was designated a in 1964, and was named part of a UNESCO World Heritage Site ("Paris, Banks of the Seine") in 1991. The tower is tall, about the same height as an 81- ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reginald A
Reginald is a masculine given name in the English language meaning "king". Etymology and history The name Reginald comes from Latin meaning "king" and "ruler" symbolizing authority and leadership. It comes from combining Latin “ rex” meaning king and “nald” meaning ruler. The name is derived from ''Reginaldus'' which means "king". This name signifies a ruler or kingly figure, representing authority and leadership. This Latin name is a Latinisation of a Germanic language name. The Germanic name is composed of two elements: the first ''ragin'', meaning "advice", "counsel", "decision"; the second element is ''wald'', meaning "rule", "ruler". The Old German form of the name is ''Raginald''; Old French forms are ''Reinald'' and ''Reynaud''. Forms of this Germanic name were first brought to the British Isles by Scandinavians, in the form of the Old Norse ''Rögnvaldr''. This name was later reinforced by the arrival of the Normans in the 11th century, in the Norman forms ''Re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Michael I
Michael I may refer to: * Pope Michael I of Alexandria, Coptic Pope of Alexandria and Patriarch of the See of St. Mark in 743–767 * Michael I Rangabe, Byzantine Emperor (died in 844) * Michael I Cerularius, Patriarch Michael I of Constantinople (c. 1000–1059) * Michael I of Duklja, Prince and King of Duklja and (d. 1081) * Mikhail of Vladimir (died in 1176) * Michael I Komnenos Doukas (died in 1215) * Michael I of Russia (1596–1645) * Michael I of Poland (Michał Korybut Wiśniowiecki), King of Poland and Grand Duke of Lithuania (1640-1673) * Michael I of Portugal (1802–1866) * Michael I of Serbia (1823–1868) * Mihály Cseszneky de Milvány et Csesznek, Michael I of Macedonia (1910–1975) * Michael I of Romania Michael I ( ; 25 October 1921 – 5 December 2017) was the last King of Romania, reigning from 20 July 1927 to 8 June 1930 and again from 6 September 1940 until his forced abdication on 30 December 1947. Shortly after Michael's birth, his f ... ( ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
