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Topic: Alexanderson alternator

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	Alternator - Wikipedia, the free encyclopedia
		Alternating current generating systems were known in simple forms from the discovery of the magnetic induction of electric current.
		Alternators generate electricity by the same principle as DC generators, namely, when the magnetic field around a conductor changes, a current is induced in the conductor.
		The Alexanderson alternator was the first form of radio transmitter to be modulated to carry the sound of the human voice.
	en.wikipedia.org /wiki/Alternator (2256 words)

	Alternator: Definition and Links by Encyclopedian.com
		Alternators are simpler, more reliable, and more efficient than direct current...
		An alternator is a generator that produces alternating current.
		Alternators are simpler, more reliable, and more efficient than direct current generators.
	www.encyclopedian.com /al/Alternator.html (193 words)

	Alternator » Blog Archive » Alternator diagram
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	alternator.cuxiann.info /2006/6/16/alternator-diagram (648 words)

	Ernst Alexanderson - Wikipedia, the free encyclopedia
		He designed the Alexanderson alternator, a high-frequency generator for longwave transmissions, which made modulated (voice) radio broadcasts practical.
		In the summer of 1906 Dr. Alexanderson presented a 50 kHz alternator that was installed in Fessenden's radio station in Brant Rock, Massachusetts.
		Alexanderson was also instrumental in the development of television.
	en.wikipedia.org /wiki/Ernst_Alexanderson (462 words)

	Transoceanic Radio Communication--extract (1920)
		This collecting transformer is thus to be considered as an integral part of the generating unit; and for all purposes of calculation the characteristics of the generating unit, such as electromotive force and current, are given as delivered from this secondary winding.
		When the radio frequency alternator is used as a source of radiation the wave length is determined directly by the rotative speed of the machine.
		However, inasmuch as the output of the alternator varies continually with the making of dots and dashes of the telegraph code, the motor is alternately loaded and not loaded, therefore, the tendency would be for the motor to speed up during the intervals.
	earlyradiohistory.us /1920alt.htm (2105 words)

	Invent Now \| Hall of Fame \| Search \| Inventor Profile
		In 1904, Alexanderson was assigned to build a high-frequency machine that would operate at high speeds and produce a continuous-wave commission.
		Beforethe invention of his alternator, radio was an affair only of dots and dashes transmitted by inefficient crashing spark machines.
		Alexanderson's name also will be recorded in history for his pioneer efforts in television and the transmission of pictures.
	www.invent.org /hall_of_fame/2.html (236 words)

	Tekniska museet - uppfinningar, experiment, utstÃ¤llningar om teknikhistoria, Teknorama.
		Alexanderson was brought in as Chief Engineer at the new corporation, and subsequently shared his working time between GE and RCA until 1924, when he returned to working full time at GE.
		During the 1930s, Alexanderson began to interest himself in the transmission of high-voltage direct current with the help of mercury arc inverters, thyratrons, which had previously been developed by himself and his good friend Dr. Irving Langmuir, who was awarded the Nobel Prize in Chemistry in 1932.
		Ernst Alexanderson was honoured posthumously in 1983, when he was elected, for his invention of the high-frequency alternator, to join the ranks of distinguished inventors in the National Inventors Hall of Fame.
	www.tekniskamuseet.se /templates/Page.aspx?id=14152 (1693 words)

	Yes90 tviNews S90 109 Ernst Fredrik Werner Alexanderson Biography and TimeLine. b: Jan. 25, 1878 - d: May 14, 1975 the ...
		Alexanderson first assignment a member of the GE engineering staff in l904, was designing generators under Dr. Steinmetz.
		Ernst Alexanderson was born in Upsala, Sweden, on Jan. 25, 1878.
		Alexanderson had been employed at General Electric for only a short period of time when GE received an order from Canadian-born professor and researcher Reginald Fessenden for an alternator with 1000 times higher frequency than any in existence at that time.
	smart90.com /alexanderson (3435 words)

	Britain.tv Wikipedia - Alternator
		The rotor magnetic field may be produced by induction (in a "brushless"?title=generator), by permanent magnets (usually in very small machines), or by a rotor winding energized with direct current through slip rings and brushes.
		One drawback of this arrangement is that if the warning light fails or the "exciter"?title=wire is disconnected, no priming current reaches the alternator field windings and so the alternator will not generate any power.
		Nikola Tesla's U.S. Patent 447920, "Method of Operating Arc-Lamps"?title=(March 10, 1891), describes an alternator that produces high-frequency current for that time period, around 10,000 cycles per second (later to be known as hertz).
	www.britain.tv /wikipedia.php?title=Alternator (2243 words)

	Alternator » Blog Archive » Ford alternator wiring (Site not responding. Last check: 2007-10-30)
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	alternator.op-new.net /2006/6/16/ford-alternator-wiring (494 words)

	Alexanderson (Site not responding. Last check: 2007-10-30)
		Ernst Fredrik Werner Alexanderson was born on January 25, 1878, in Uppsala, Sweden, son of a judge and professor of Greek.
		During the 1930s, Alexanderson began to interest himself in the transmission of high-voltage direct current with the help of mercury arc inverters, thyratrons, which had previously been developed by himself and his good friend Dr.
		Alexanderson retired from General Electric in 1948 although he continued as a consultant to the company for several more years.
	chem.ch.huji.ac.il /~eugeniik/history/alexanderson.html (2487 words)

	[Lf] SAQ history from IEEE history society web page. (Site not responding. Last check: 2007-10-30)
		At the heart of the Grimeton station was an Alexanderson alternator, the transmitter technology invented by Sweden's own Ernst F W Alexanderson in 1910.
		With the Alexanderson alternator, manufactured by General Electric and sold by RCA, the Grimeton station was able to begin transatlantic transmissions in1924.
		Using what is claimed to be the last functioning Alexanderson alternator, the station last year broadcast a message to the IEE's "100 years of radio" conference held in London.
	www.amrad.org /pipermail/lf/2000q2/000473.html (374 words)

	Info Age - A. Hoyt Taylor-Alternator
		By the time I arrived, the first practical Alexanderson alternator was in operation at New Brunswick.
		The invention of the Alexanderson alternator, to my mind, was another milestone in radio progress.
		It was the war-time experiments with this alternator on daily traffic that encouraged the development of the much larger 500 K.W. alternator which has been the backbone of RCA long distance telegraphic communication for many years.
	www.infoage.org /at_gen.html (626 words)

	Alternator, Arc and Spark - The First Wireless Transmitters
		Alexanderson was Swedish by birth but spent most of his life in America and produced his alternator for the Canadian Reginald Fessenden, who was once chief chemist and engineer for Thomas Edison.
		Alexanderson has left us with another legacy in the form of the magnetic amplifier, a saturable reactor which is controlled by a dc winding.
		It was with this that Fessenden modulated the alternator output for his 1906 broadcast and magnetic amplifiers of many forms are still used for a wide variety of purposes today.
	home.freeuk.net /dunckx/wireless/sparksnarcs/sparksnarcs.html (2582 words)

	Sore4x4: 4x4 Trails & Offroad for SW Washington & Oregon
		In a typical modern alternator, a rotating electromagnet called the rotor turns within a stationary set of conductors wound in coils on an iron core, called the stator.
		In 1891, Frederick Thomas Trouton gave a lecture which stated that, if an electrical alternator were run at a great enough speed, it would generate wireless energy [6].
		In 1904, Reginald Fessenden contracted with General Electric for an alternator that generated a frequency of 100,000 Hz for "continuous" radio.
	sore4x4.com /home/db/Alternator (1291 words)

	Ernst Alexanderson
		Alexanderson was born in Upsala, Sweden in January 1878, son of a judge and professor of Greek.
		A "mild- mannered, unassuming man", according to Michael, "Alexanderson would set out his theories and move on to something else, letting the GE labs finish off his projects." Interestingly, "it appeared he didn't realize how important he was in terms of the inventions.
		He was elected to the Royal Academy of Science in Sweden, he received the Medal of Honor from the IRE in 1919, Knighthood in Poland in 1924, The Edison Medal from the American IEE in 1944, the Royal Danish Medal in 1946, etc. etc.
	www.oldradio.com /archives/jurassic/alexan.htm (1501 words)

	Dr. Beverage on the Beverage -- antenna special on hard-core-dx.com
		Alexanderson is a well-known inventor, best known for his intervention of the Alexanderson alternator and the multiple tune, low frequency antenna.
		Alexanderson never seemed to use much mathematics, but he carried a tremendous lot of information in his head.
		It was sort of a radio barrage, so that was called "the barrage receiver." Alexanderson had figured about twenty-five ways of how you could do this, but it finally boiled down to one and I was given the job of developing "the barrage receiver".
	www.hard-core-dx.com /nordicdx/antenna/wire/beverage/interview1.html (9935 words)

	Deep Fryer Guide : Reginald Fessenden
		The Alexanderson alternator, which produced such alternating currents, was done at General Electric (with calculation supervision by Charles Proteus Steinmetz).
		He obtained an Alexanderson alternator of greater power from GE and on Christmas Eve 1906, he transmitted the first audio radio broadcast in history from Brant Rock, Massachusetts.
		It took years for Alexanderson to develop an alternator capable of transmitting regular voice transmissions over the Atlantic, but by 1916 the Fessenden-Alexanderson alternator was more reliable for transatlantic communication than the spark apparatus.
	deep-fryer-guide.com /a/159164/Reginald+Fessenden.html (1553 words)

	Reference.com/Encyclopedia/Ernst Alexanderson
		He designed the Alexanderson alternator, a high-frequency generator for longwave transmissions.
		He had been employed at General Electric for only a short period of time when GE received an order from Canadian-born professor and researcher Reginald Fessenden for an alternator 1000 times more powerful than any in existence at that time.
		Over his lifetime, Dr. Alexanderson received 344 patents, the last awarded in 1973 at age 94.
	www.reference.com /browse/wiki/Ernst_Alexanderson (319 words)

	OTB - Below 535, A Historical Review of Continuous Wave Radio Frequency Power Generators
		Modulation of the two alternator designs was done primarily by diverting the alternator's output power, or by detuning an impedance matching circuit at the alternator's output.
		The arc converter and Goldschmidt Alternator were most successful when made to operate in the frequency range of a few kilohertz to a few tens of kilohertz.
		Designing the Alexanderson Alternator for the lower frequencies was also helpful; it lowered the rotor speed and lightened the design and manufacturing tolerances.
	www.antiquewireless.org /otb/blw535202.htm (1969 words)

	Jurassic Radio, Part 5: RF Generators
		Where Alexanderson’s alternator directly generated 60 kilohertz or more, the Joly-Arco alternator at Sayville operated at only 9,613 Hertz, feeding its output into a static frequency converter (a special type of tuned transformer) that resulted in a doubling of the pulse frequency to 19,266 Hertz.
		The grandest plan of the Age of Alternators was put forth at the inception of RCA, which at first intended to build a monstrous plant of six 200 kilowatt Alexanderson alternators at Rocky Point on Long Island.
		Today, one remaining Alexanderson dinosaur lives at Grimeton, near Goteborg, Sweden, where the RCA station in Alexanderson’s home nation is maintained in mint condition as a national museum of technology, complete with its six 500 foot antenna towers.
	www.oldradio.com /archives/jurassic/dk-rf_gens.htm (1471 words)

	Radio Story
		The Alexanderson alternator was a popular model in its time, and today, only a sole operational example survives in the whole world.
		During WWII, Alexanderson alternators located in Hawaii, were the only reliable long-haul method of communicating from the United States west coast to the fleet submarines 24 hours per day, seven days a week.
		The alternator itself runs between 2,500 to 3,000 rpm, and needs to be set precisely to the correct speed in order that it's 300 poles will generate the required frequency of 17.2 kHz.
	www.jproc.ca /radiostor/aalt.html (892 words)

	8. Alternator-Transmitter Development (1891-1920)
		High-speed electrical alternators was one approach used to generate continuous-wave signals, and by 1919 international control of the Alexanderson alternator-transmitter was considered so important that it triggered the formation of the Radio Corporation of America.
		In a 1891 lecture, Frederick T. Trouton noted that if an electrical alternator could somehow be run fast enough, it would generate electromagnetic radiation, as reported in Radiation of Electric Energy--Alternator extract, from the January 22, 1894 The Electrician (London).
		Meanwhile, Ernst Alexanderson, the lead General Electric engineer for the original Fessenden alternator, continued to work on improvements, and eventually developed alternators with power ratings of hundreds of kilowatts.
	earlyradiohistory.us /sec008.htm (765 words)

	The Grimeton Radio Station - National Heritage Board (Site not responding. Last check: 2007-10-30)
		With an aerial system of six impressive steel towers and an Alexanderson alternator, the transmitter symbolizes a crucial step in the evolution of modern wireless communications and is the only one of its kind still in operation.
		Grimeton’s pride, and the heart of the transmitter, is an alternating current generator dubbed the Alexanderson alternator.
		The Alexander alternator is the heart of the transmitter.
	www.raa.se /varveng/grimetone.asp (409 words)

	History of radio - Wikipedia, the free encyclopedia
		Around the turn of the century, the Slaby-Arco wireless system was developed by Adolphus Slaby and Georg von Arco (later incorporated into Telefunken).
		On Christmas Eve of 1906, Reginald Fessenden used an Alexanderson alternator and rotary spark-gap transmitter to make the first radio audio broadcast, from Brant Rock, Massachusetts.
		He had also given a lecture a year earlier, called "Experiments with Alternate Currents of High Potential and High Frequency", in London (Available at Project Gutenberg).
	en.wikipedia.org /wiki/History_of_radio (3890 words)

	Ernst Alexanderson
		Alexanderson: a machine which would generate a frequency of 100,000 Hertz.
		By 1925, Alexanderson was experimenting with television, broadcasting to something over 300 TV sets in Schenectady, NY.
		Alexanderson was certainly one of the key figures in radio and TV history, if not a piviotal one, although he is not often given the recognition today that some, including George Michael, feel he is due.
	www.infoage.org /ealexan.html (1351 words)

	[No title]
		During WWII, the Alexanderson alternators in Hawaii were the only reliable long-haul to the west coast and to the fleet subs, 24 hrs a day, 7 days a week.
		The alternator runs at about 2500-3000 rpm, and needs to be set to precisely the correct speed so that its 300 or so poles will generate the 17.2 khz frequency.
		Most alternators ran on freqencies of 10-30 khz although a few ran as high as 100 khz.
	www.mines.uidaho.edu /ftp/pub/Glowbugs/GBdigests/glo-por.316 (2161 words)

	November 1996-December 1996
		The RCA Alexanderson alternator was built in 1924.
		The Alexanderson alternator was developed during the early years of wireless by Ernst Alexanderson, a Swedish-American.
		The device is essentially a large, electromechanical high-frequency alternator with a high-speed rotor that's connected directly to an antenna system.
	www.strato.net /~mcarc/sparkgap/1996news/11.html (943 words)

	Yes90 tviNews S90 109 TVInews 109 - Reginald Fessenden (1871-1932) the "R" in "Smart Daaf Boys" The ...
		In 1903 Fessenden's first high-frequency Tesla type of alternator for continuous wave transmission, was built to his specifications by General Electric, E. Alexanderson, one of the Smart Daaf Boys.
		The Alexanderson alternator, which produced such alternating currents, was done at General Electric, (Charles Proteus Steinmetz, was CEO of GE at the time).
		Finally on Christmas Eve 1906, with an upgraded Alexanderson alternator of greater power from GE, he purportedly transmitted the first audio radio broadcast in history from Brant Rock, Massachusetts.
	smart90.com /reginaldfessenden (4338 words)

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