Guglielmo Marconi war Vater von 5 Kindern, darunter Degna Marconi Paresce (* 1908).
Guglielmo Marconi war ein italienischer Radio- und Amateurfunk-Pionier, der am 25. April 1874 in Bologna geboren wurde und am 20. Juli 1937 in Rom verstarb. Marconi gründete die Wireless Telegraph & Signal Company, die später als Marconi Company bekannt wurde. Für seine praktischen Arbeiten im Bereich der Funktelegrafie erhielt er 1909 zusammen mit Ferdinand Braun den Nobelpreis für Physik. Marconi verbrachte einen Teil seiner Kindheit in England und besuchte später Schulen in Florenz und Livorno. Er erhielt Privatunterricht in Naturwissenschaften und besuchte Vorlesungen an der Universität Bologna, ohne jedoch einen Hochschulabschluss zu erlangen. Seine bedeutendsten Arbeiten entstanden zwischen 1894 und der Jahrhundertwende. 1905 heiratete er Beatrice O’Brien, mit der er drei Kinder hatte. Nach der Scheidung heiratete er 1927 Maria Cristina Bezzi Scali, mit der er eine weitere Tochter bekam. Im Jahr 1895 begann Marconi mit ersten Experimenten zu elektromagnetischen Wellen auf dem Familiensitz. Er entwickelte ein Gerät zur Aufspürung elektrischer Schwingungen und führte erfolgreiche Sendeversuche durch. 1896 ging Marconi nach England, wo er seine Erfindung demonstrierte und patentieren ließ. Er erhielt Unterstützung vom Chefingenieur des British General Post Office und führte erfolgreiche Sendeversuche im Bristolkanal durch. Marconi gründete 1897 die Wireless Telegraph and Signal Co. in London und erhielt finanzielle Unterstützung durch seine Familie. Es folgten weitere Firmengründungen in den USA und im internationalen Schifffahrtsbereich. Um 1900 erreichte Marconi durch eine technische Verbesserung eine Steigerung der Reichweite und Selektivität. Er baute eine Funkstation in Poldhu, um eine transatlantische Verbindung herzustellen. 1901 gelang ihm der erste, allerdings umstrittene transatlantische Funkempfang. Später konnte er die Sendeanlage verbessern und eindeutige Testnachrichten übertragen. 1903 tauschte er Grußbotschaften zwischen dem US-Präsidenten und dem englischen König aus. Marconi war auch an der Gründung von Radio Vatikan beteiligt.
Guglielmo Marconi wurde in Bologna, Italien, geboren.
Bilder zum Thema Guglielmo Marconi
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Bildquelle: Young_Marconi.jpeg Autor: Wikipedia / Published on LIFE Lizenz: gemeinfrei
Electrical engineer/inventor Guglielmo Marconi as a young man.
Electrical engineer/inventor Guglielmo Marconi with the spark-gap transmitter (right) and coherer receiver (left) he used in some of his first long distance radiotelegraphy transmissions during the 1890s.
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Bildquelle: Guglielmo_Marconi_1902.jpg Autor: Wikipedia / Unknown authorUnknown author Lizenz: gemeinfrei
G Marconi Portrait that hung in Canadian Marconi Company Corporate offices in Montreal for many years. This original is in my possession but I am unsure of copyright and do not claim such. It was said that he lost an eye in a car accident when he was driving in Italy in 1912 and this is the reason that he is looking down.
1962 the writer Luigi Silori, the movie director Alessandro Blasetti, the journalist Gianni Bisiach receive in Grosseto the Award Guglielmo Marconi for best 1962 Italian TV program
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Bildquelle: Antenne_marconi_intensité.jpg Autor: Wikipedia / Guglielmo Marconi et modification F1jmm Lizenz: gemeinfrei
ventre des intensités de l'antenne long fil utilisées en Marconi.
A Marconi 'Billi Condenser' - an early variable capacitor. 'Billi' because it stores what was then known as one billifarad (one nanofarad). Most likely it is a copy built in 1932 by Officine Galileo for the CNR and intended for the Chicago exhibition of 1933. It consists of a wooden cylinder half covered with a double layer of copper and waxed paper. A copper sleeve slides on this cylinder. Both on the fixed part (in copper and wax wood) and on the copper sleeve there is a cable clamp for connection to the receiver circuit
One of the earliest prototype magnetic detectors, built by inventor Guglielmo Marconi and used in his wireless experiments on board the ship Carlo Alberto in the summer of 1902.
Eaglehurst - Calshot, England. Built for General Richard Lambart in the early 1800s. At various times, the home of Guglielmo Marconi and architect Clough Williams-Ellis.
In 1902 Marconi invented two forms of magnetic detector, one of which he developed into an electric wave detector of extraordinary delicacy and utility (see Proc. Roy. Soc., 1902, 70, p. 341, or British Pat. Spec. No. 10245 of 1902). In this last form an endless band of hard iron wires passes slowly round two wooden pulleys driven by clockwork. In its course it passes through a glass tube wound over with two coils of wire; one of these is an oscillation coil through which the oscillations to be detected pass, and the other is in connexion with a telephone. Two horse-shoe magnets are so placed (see figure) that they magnetize the part of the iron band passing through the coil. Owing to hysteresis the part of the band magnetized is not symmetrically placed with regard to the magnetic poles, but advanced in the direction of motion of the band. When the oscillations pass through the coil they annul the hysteresis and cause a change of magnetism within the coil connected to the telephone. This creates a short sound in the telephone. Hence according as the trains of oscillations are long or short so is the sound heard in the telephone, and these sounds can be arranged on the Morse code into alphabetic audible signals. When used as a receiver for wireless telegraphy Marconi inserted the oscillation coil of this detector in between the earth and a receiving antenna, and this produced one of the most sensitive receivers yet made for wireless telegraphy.
Guglielmo Marconi's early wireless telegraphy transmitter (left) and receiver (right) from the 1890s with which he performed the first radio communication experiments.
The spark gap transmitter consisted of an induction coil (I) powered by a battery (B) connected to a spark gap (S) consisting of two metal balls with a gap of a few millimeters between them. One spark ball was connected to a monopole antenna (A1) consisting of a wire that went up to a metal sheet suspended high overhead. The other spark ball was connected to ground (E). High voltage from the induction coil charged up the antenna to a high voltage which was discharged by a spark between the spark balls. The spark excited oscillating standing waves of current in the antenna; the charge flowed back and forth between the ground and the antenna through the spark, charging the antenna alternately positive and negative. The antenna radiated this energy as radio waves. To communicate information with this device the operator tapped on the telegraph key (K) in the primary circuit of the induction coil, turning the transmitter on and off rapidly, transmitting pulses of radio waves which spelled out text messages in Morse code.
The receiver (right) consisted of a similar metal plate monopole antenna (A2) connected to a primitive radio wave detector called a coherer (C), consisting of a glass tube with electrodes at either end with loose metal powder between them. Radio waves from the transmitter created an oscillating voltage in the receiving antenna which was applied to the coherer. The coherer was also connected to a DC circuit with a battery (B1) and relay (R). The radio voltage caused the metal powder to "cohere" or stick together, which lowered the resistance of the coherer. Current from the battery flowed through the coherer and actuated the relay, applying current from the second battery (B2) to a Morse siphon recorder (M) which recorded the pulses of the messages as ink lines on a paper tape. The receiving operator later read the tape, translating the Morse code pulses back into text, writing down the message.
The usual forms of the receiving appliance which consists of a receiving antenna similar to the sending antenna, and in any wireless telegraph station it is usual to make the one and the same antenna do duty as a receiver or sender by switching it over from one apparatus to the other. The electric waves coming through space from the sending station strike against the receiving antenna and set up in it high frequency alternating electromotive forces. To detect these currents some device has to be inserted in the antenna circuit or else inductively connected with it which is sensitive to high frequency currents. These wave-detecting devices may be divided into two classes: (i) potential operated detectors, and (ii) current operated detectors. The oldest of the class (i) is that generically known as a coherer. The ordinary forms of metallic filings coherer of the Branly type require tapping to bring them back to the high resistance or sensitive condition. Lodge arranged a mechanical tapper for the purpose which continually administered the small blow to the tube sufficient to keep the filings in a sensitive condition. Popoff employed an electromagnetic tapper, in fact the mechanism of an electric bell with the gong removed, for this purpose. Marconi, by giving great attention to details, improved the electromagnetic tapper, and, combining it with his improved form of sensitive tube, made a telegraphic instrument as follows: the small glass tube, containing nickel and silver filings between two silver plugs, was attached to a bone holder, and under this was arranged a small electromagnet having a vibrating armature like an electric bell carrying on it a stem and hammer. This hammer is arranged so that when the armature vibrates it gives little blows to the underside of the tube and shakes up the filings. By means of several adjusting screws the force and frequency of these blows can be exactly regulated. In series with the tube is placed a single voltaic cell and a telegraphic relay, and Marconi added certain coils placed across the spark contacts of the relay to prevent the local sparks affecting the coherer. The relay itself served to actuate a Morse printing telegraph by means of a local battery. This receiving apparatus, with the exception of the Morse printer, was contained in a sheet-iron box, so as to exclude it from the action of the sparks of the neighbouring transmitter. In the early experiments Marconi connected the sensitive tube in between the receiving antenna and the earth plate, but, as already mentioned, in subsequent forms of apparatus he introduced the primary coil of a peculiar form of oscillation transformer into the antenna circuit and connected the ends of the sensitive tube to the terminals of the secondary circuit of this “jigger” (see figure). In later improvements the secondary circuit of this jigger was interrupted by a small condenser, and the terminals of the relay and local cell were connected to the plates of this condenser, whilst the sensitive tube was attached to the outer ends of the secondary circuit. Also another condenser was added in parallel with the sensitive tube.
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Bildquelle: Edna_Owen.jpg Autor: Wikipedia / Unknown authorUnknown author Lizenz: gemeinfrei
Photograph shows Italian inventor Guglielmo Marconi (1874-1937) who served as a member of the Italian War Commission to the United States in 1917 with Hunter College students enrolled in a radio class for women wireless telegraphers. To the right of Marconi is Edna Owen (Mrs. Herbert Sumner Owen), the director of the course which was run by the National League for Women's Service. (Source Flickr Commons project, 2015 and The Wireless Age, v. 4, Oct. 1916)
Title: Everything is radio on Marconi's yacht - a "personal dance" on board the palatial vessel while on the trip to Albany Showing Josephine Young of Riverside, Conn., and J.W. Elwood of New York, equipped with a portable radio outfit dancing to the tunes of a broadcasted fox trot while making the trip to Albany on Senator Guglielmo Marconi's yacht Elettra.
Abstract/medium: 1 photographic print.
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Bildquelle: Famoita1.jpg Autor: Wikipedia / M.V.E.i. at English Wikipedia Lizenz: gemeinfrei
Pictures are public domain taken from Wikimedia.
Galileo Galilei, Michelangelo, Alessandro Volta, Guglielmo Marconi, Leonardo da Vinci, Giordano Bruno.
Von der Pierre Bergère in Salvan führte der spätere Nobelpreisträger für Physik Guglielmo Marconi erste Experimente mit drahtloser Signalübertragung durch. Eine Plakette auf der Seite des Steins erinnert daran.
Physicist Irving Langmuir (center) in his lab at General Electric in 1922, showing radio pioneer Guglielmo Marconi (right) a new 20 kW triode vacuum tube GE has developed for radio transmitters. Langmuir, a pioneer in vacuum technology and the inventor of the diffusion pump, is responsible for developing the modern "hard vacuum" radio tubes. The man on the left is Willis R. Whitney, director of GE's research lab.
Title: ITALIAN COMMISSION TO U.S. AT CENTER: SEC. LANSING AND H.R.H. FERDINAND DI SAVOIA, PRINCE OF UDINE. COUNT MACCHI DI CELLEN, AMBASSADOR TO U.S. AT REAR, LEFT OF LANSING. BORSARELLI. REAR RIGHT OF UDINE. COL. HART, REAR RIGHT; MARCONI AT LEFT. IN 8775: EURICO ALLIATO
Abstract/medium: 1 negative : glass ; 5 x 7 in. or smaller
Title: ITALIAN COMMISSION TO U.S. AT CENTER: SEC. LANSING AND H.R.H. FERDINAND DI SAVOIA, PRINCE OF UDINE. COUNT MACCHI DI CELLEN, AMBASSADOR TO U.S. AT REAR, LEFT OF LANSING. BORSARELLI. REAR RIGHT OF UDINE. COL. HART, REAR RIGHT; MARCONI AT LEFT. IN 8775: EURICO ALLIATO
Abstract/medium: 1 negative : glass ; 5 x 7 in. or smaller
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