
	Where results make sense

Topic: Valdemar Poulsen

	Poulsen
		Valdemar Poulsen, son of a Danish High Court judge was born 23rd November 1869 in Copenhagen.
		Poulsen's arc as a generator of continuous waves differed from the usual arc since it burned in an atmosphere of a hydrocarbon gas in a strong transverse magnetic field.
		Poulsen's great discovery was the effect of a hydrogen atmosphere which by cooling the arc increased the steepness of its characteristic curve, and also the use of very powerful magnetic field which enabled him to get a high terminal voltage.
	www.geocities.com /neveyaakov/electro_science/poulsen.html (2560 words)

	Valdemar Poulsen - Biocrawler (Site not responding. Last check: 2007-10-12)
		The magnetic recording was demonstrated in principle as early as 1898 by Valdemar Poulsen in his telegraphone.
		Poulsen developed an Arc Converter in 1908, referred to as the "Poulsen Arc Transmitter".
		A stamp was issued in honor of Poulsen in 1969.
	www.biocrawler.com /encyclopedia/Valdemar_Poulsen (165 words)

	Valdemar Poulsen Summary
		Valdemar Poulsen was a Danish engineer who invented the magnetic recorder in 1898.
		Poulsen obtained a Telegraphone Patent in 1898, and with his assistant, Peder O. Pedersen, later developed other magnetic recorders that recorded on steel wire, tape, or disks.
		Poulsen developed an arc converter in 1908, referred to as the "Poulsen Arc Transmitter," which was widely used in radio before the advent of vacuum tube technology.
	www.bookrags.com /Valdemar_Poulsen (899 words)

	Valdemar Poulsen
		Valdemar Poulsen, son of a Danish High Court judge was born 23rd November 1869.
		In an early experiment Poulsen stretched a steel wire between two parallel walls, inclined at such an angle that a small electromagnet suitably attached to the wire could, assisted by gravity, slide down the wire at a uniform speed.
		It consisted of a 4.5 inch diameter steel disk with a raised spiral on the surface which was traced by the electromagnet as the disk rotated.
	www.amps.net /newsletters/issue27/27_poulsen.htm (1145 words)

	Valdemar Poulsen - Federal Telegraph Company Arc Wireless Station - 1912
		Primary force behind the commercial development of Valdemar Poulsen's arc wireless transmission method was Cyril Frank Elwell (1884- 1963), a Stanford student who convinced the inventor to license his patents in the United States to him.
		Poulsen's agreement with Elwell required that the patents could not be turned over to any existing telegraph companies because Poulsen feared they would throttle development of wireless communication.
		Poulsen stations were taken over and used by the U.S. Navy during World War I. In 1921 the Poulsen patents and stations were given back to Federal Telegraph Co. which, between 1921 and 1923, built new stations in San Francisco, Portland and Los Angeles.
	www.sfmuseum.org /hist/poulsen.html (1189 words)

	Voice Will Carry Across the Sea (1908) (Site not responding. Last check: 2007-10-12)
		Poulsen, assisted by a staff of Danish engineers, has been at work for a long time in undertaking to make telephoning by means of his undamped and continuous waves practicable and useful in commercial transactions.
		Poulsen had about finished his work with the wireless telegraph he had become convinced that the transmission of oral human speech through the air was possible and at great distances, if he could construct an apparatus for transmission and recording sufficiently strong and powerful.
		Poulsen at his station at Lyngby clearly heard the voices of his assistants and understood distinctly all that they were saying to him from their station at Weisensee, he was overjoyed.
	earlyradiohistory.us /1908voic.htm (550 words)

	IEEEVM: Valdemar Poulsen
		Valdemar Poulsen was an important inventor in many fields of electrical engineering, and is sometimes called the "Danish Edison." He was born 23 November 1869 in Denmark.
		Poulsen’s first major invention was made while he was working for this telephone company.
		Poulsen's interests had turned to the field of radio In the early 1900s, radio, or wireless as it was called, could only transmit telegraph code, not voice.
	www.ieee-virtual-museum.org /collection/people.php?taid=&id=1234678&lid=1 (427 words)

	IEEE History Center: Poulsen-Arc Radio Transmitter, 1902
		Valdemar Poulsen, a Danish engineer, invented an arc converter as a generator of continuous-wave radio signals in 1902.
		Poulsen was already known for another invention, the Telegraphone, the world's first functional magnetic recorder, patented in 1899.
		Poulsen's transmitter was used worldwide in the second and third decades of the century until it was displaced by transmitters that employed the vacuum tube as a generator of continuous waves.
	www.ieee.com /web/aboutus/history_center/poulsen.html (276 words)

	Telegraphon
		Valdemar Poulsen, Danish telephone engineer and inventor, patented the Telegraphone in 1898.
		On 1st December 1898, Poulsen filed a patent in Denmark for the Telegraphone, the first device in history to use magnetic sound recording.
		That the idea of recording sound magnetically was Poulsen's alone is proven by the fact that nobody else has ever claimed credit for the invention.
	cs-exhibitions.uni-klu.ac.at /index.php?id=220 (345 words)

	OOIZZ Systems
		Endelig viste Poulsen, at for at faa høje Frekvenser og samtidig stærke Dtrømme — altsaa en kraftig Højfrekvensgenerator — maatte Buen brænde i et efter Forholdene afpasset stærkt Magnetfelt.
		Kære Poulsen, Du vil altid og ubestridt staa som en af Radioteknikkens fornemste Pionerer, og vi bøjer os i dybeste Ærbødighed for Dig og med hjertelig Tak til Dig for, hvad Du har udrettet til Radioteknikkens Fremme, til Glæde for alle Dine Venner, til Hæder for vort Land.
		Og endelig, at det var Valdemar Poulsen, der ved opfindelsen at "Telegrafonen" blev båndoptagerens opfinder og skabte grundlaget for den seneste fantastiske udnyttelse af den magnetiske registrering på elektronikkens område, og dermed har indskrevet sit og Danmarks navn i den tekniske historie.
	www.tekniskmuseum.dk /mod_inc/?p=itemModule&id=272&kind=9 (2897 words)

	Valdemar Poulsen: Inventor of Voice Mail (Site not responding. Last check: 2007-10-12)
		Poulsen's first demonstration device was simply a steel chisel edge along which he moved a small pickup coil.
		Poulsen's original Danish patent application indicated his Telegraphone was intended for use to answer unattended telephone lines and record messages for later playback.
		Thus, we see that Valdemar Poulsen's first plan for his development was to provide Copenhagen Telephone Company with central office based voice mail, which of course, has a parallel in the telephone answering machine and other forms of voice mail we now encounter daily.
	www.beagle-ears.com /lars/engineer/telecom/vpoulsen.htm (1751 words)

	Finn Jorgensen
		Valdemar Poulsens invented magnetic recording was proceeded by, whether he knew it or not we don't know, but there was an American named Oberlin Smith that wrote a couple of elegant dissertations on the possibility of recording magnetic sound.
		Valdemar Poulsen was assisted in his many further years after the invention of magnetic recording.
		He was not an inventor but he would be the one that would take Valdemar Poulsen's ideas and tear them apart or support them and analyze them in a analytical fashion and that worked extremely well throughout the rest of his life till he passed away in 1942.
	www.magneticdiskheritagecenter.org /100th/Progress/Jorgensen/finnjorgensen1.htm (3663 words)

	Lemelson-MIT Program
		Poulsen's model used a brass cylinder embedded in grooves, which would move along a wire attached to the grooves, like a trolley.
		In 1900, Poulsen's Telegraphone was exhibited at the Exposition Universelle in Paris.
		In 1903, Poulsen founded the American Telegraphone Company with some associates from the U.S. to manufacture the devices, which were used mainly for office dictation and telephone message recording.
	web.mit.edu /invent/iow/poulsen.html (514 words)

	Jurassic Radio, Part 1: Poulsen
		Poulsen is perhaps best known for his other major contribution to the art of telecommunications, a literal fire-breathing monster that functioned as a radio transmitter.
		Valdemar Poulsen rightly deserves a place in such a group for his contributions to man’s shrinking of time and space; to man’s increase of social intercourse, and thus, one would hope, the furtherance of peace and harmony in the world today.
		Poulsen's earliest patent papers showed he was aware that tape was a practical option to wire.
	www.oldradio.com /archives/jurassic/dk-poulsen.htm (1840 words)

	Valdemar Poulsen og telegrafonen
		I 1898 opfandt den danske telefontekniker Valdemar Poulsen et apparat, kaldet Telegrafonen, der kunne optage, gemme og gengive lyd.
		Valdemar Poulsen menes ikke at have haft kendskab til Janets arbejder.
		I 1898 opfandt Valdemar Poulsen en elektromagnetisk fonograf, der ved hjælp af elektromagnetisme, kunne optage, gemme og gengive lyd som f.eks.
	www.rostra.dk /louis/andreart/ValdemarPoulsen.html (1998 words)

	Hans Buhl: The Poulsen Arc Transmitter
		The technological ancestor of the Poulsen arc was William Duddell's "musical arc", an electric oscillator made from an arc lamp, shunted by a condenser and a coil to form a tuned resonant circuit.
		Being a very practically oriented engineer, Poulsen performed intuitive experiments in which he tried out many different modifications of singing arcs, and one day he observed that the frequency of the oscillations could be increased by letting the arc burn in the vapor of a spirit lamp.
		During the war the Poulsen system had achieved international recognition, mainly due to a rapid development in the United States and therefore the old transmitter in Lyngby was replaced twice by bigger transmitters, which for instance were used in the first Danish radio broadcasts (chapter 8).
	www.stenomuseet.dk /person/hb.ukref.htm (3048 words)

	Valdemar Poulsen - Search Results - MSN Encarta
		Valdemar Poulsen - Search Results - MSN Encarta
		Poulsen, Valdemar (1869-1942), Danish telephone engineer and inventor of the telegraphone, the first practical apparatus for recording and...
		Sound recording and reproduction began in the late 19th century, as several key inventions brought us the technology to change energy from one state...
	ca.encarta.msn.com /Valdemar_Poulsen.html (67 words)

	Valdemar Poulsen (Site not responding. Last check: 2007-10-12)
		Valdemar Poulsen (1869 - 1942)was a Danish engineer.
		Magnetic wirerecording, and its successor, magnetic tape recording, involve the use of a magnetizable medium which moves with a constant speedpast a recording head.
		Poulsen, Valdemar, " US661619 Method of Recordings and Reproducing Sounds or Signals ".Magnetic Tape Recorder.
	www.therfcc.org /valdemar-poulsen-160750.html (154 words)

	Peter Laurits Jensen (Site not responding. Last check: 2007-10-12)
		In 1903 Jensen went to Copenhagen as an apprentice in the laboratory of radio pioneer Valdemar Poulsen.
		Poulsen had just developed an improved transmitter for generating continuous radio waves.
		As his assistant, Jensen was involved in Poulsen's efforts to broadcast the human voice rather than telegraphic impulses.
	www.ce.org /Events/Awards/437.htm (542 words)

	Technology Review: Making Steel Speak
		It was 100 years ago that Valdemar Poulsen, an engineer with the Copenhagen Telephone Company, applied for a patent on his "telegraphone," a device that recorded the human voice magnetically on a steel piano wire.
		Using the 1898 model of the Poulsen telegraphone (shown above), one could capture a 45-second message on a 100-meter wire wound on a rotating cylinder; the playback sound was free from the characteristic scratching of the phonograph.
		Poulsen had originally intended his telegraphone to be used as a telephone answering machine, but for years ATandT executives opposed this application, fearing that many people would not use telephones if they thought their conversations might be recorded.
	www.technologyreview.com /read_article.aspx?id=11723 (427 words)

	USS Valdemar - Memory Alpha - A Wikia wiki
		The USS Valdemar was a Federation starship that was in service during the late 24th century.
		In 2370 the Valdemar was dispatched to the border of the Cardassian Demilitarized Zone, following the arrest of Starfleet officer Miles O'Brien.
		The Valdemar may have been named for one of the historical kings of Denmark, and some have speculated that it was named after the fictional land created by Mercedes Lackey.
	www.memory-alpha.org /en/wiki/USS_Valdemar (177 words)

	Jurassic Radio, Part 3: More Poulsen
		Poulsen was known to be a reader of current literature of the time; thus he must have known of the efforts of other telephone developers like John Stone Stone.
		Poulsen hoped, by this means, to produce a telephone "carrier" system and perhaps also, to be able to launch its signals with antennae between the numerous islands of Denmark, to extend his employer’s telephone network rapidly and economically.
		The advantage of the Poulsen arc in those early days was that it could produce rather narrowband CW signals for direct application to the antenna.
	www.oldradio.com /archives/jurassic/dk-poulsen2.htm (1563 words)

	The Poulsen arc
		Poulsen solved this problem by inserting a 'tikker' between the detector and the telephones.
		Federal Telegraph Company 60 kW Poulsen arc, corresponding to 500 V and 120 A. It was this arc which has carried a portion of the trans-Atlantic traffic from Tuckertown, New Jersey to Hannover, Germany, a distance of 6500 km.
		The antenna current was 120 A. Federal Telegraph Company 100 kW Poulsen arc used for communication between the United States Naval Radio Station at Darien, Panama Canal Zone and Washington, a distance of 3000 km.
	hjem.get2net.dk /helthansen/poulsenarc.htm (399 words)

	Radio Pioneers
		Danish engineer and inventor Valdemar Poulsen (1869-1942) is best known for the invention of magnetic recording, but also invented the arc radio transmitter in 1903.
		Poulsen's arc burned in a pure hydrogen atmosphere within a strong magnetic field, which created continuous radio waves with practical efficiency and less radio noise than the spark transmitter.
		Poulsen had a laboratory in Palo Alto, CA in the pre-WWI years, and teamed up with Federal Telegraph Company to produce commercial versions of his transmitter, some generating as much as 500 kilowatts of power.
	www.moah.org /exhibits/archives/radio/radiopioneers.html (2144 words)

	Magnetic Recording History Pictures
		Valdemar Poulsen in Denmark would succeed in 1898 where Smith had failed.
		Poulsen had become a telephone engineer at the Copenhagen Telephone Company in 1893 and began to experiment with magnetism to record telephone messages.
		Poulsen stopped his work on magnetic recording and turned to radio after 1902, and only a small number of his machines were made in Denmark and Germany.
	history.sandiego.edu /gen/recording/tape.html (798 words)

	H2G2 (Site not responding. Last check: 2007-10-12)
		Unaware of work by Oberlin Smith, Poulsen took the principle even further by designing a hard steel wire media that could be magnetised and demagnetised continuously along its length.
		At this exhibition, Poulsen recorded the voice of Emperor Franz Joseph, which is still preserved today.
		Poulsen's recorder used a steel wire wrapped in grooves around a cylinder, similar in appearance to Edison's cylinder phonograph.
	www.bbc.co.uk /dna/h2g2/pda/A3224936?s_id=4 (191 words)

	Valdemar Poulsen (Site not responding. Last check: 2007-10-12)
		Poulsen patented this first functional magnetic audio recorder in 1898.
		He became interested in magnetic recording because he was frustrated that telephone callers could not leave a message when the party at the other end was not available.
		Poulsen also is credited with helping make low-wave radio broadcasting possible by 1920.
	www.ce.org /print/Events/Awards/439.htm (208 words)

	MIK - Poulsen, Valdemar
		Valdemar blev født i 1869 som søn af højesteretsassessor Jonas Poulsen og hans hustru.
		Valdemar Poulsen opdagede, at man kunne tale i en mikrofon og få dens elektriske signaler til at magnetisere en plade eller ståltråd, så talen senere kunne afspilles igen.
		Den opfindelse, der gjorde Valdemar Poulsen berømt i 1900-tallets første årtier, var den såkaldte buesender eller buegenerator, som han udviklede sammen med ingeniøren P.O. Pedersen og fik patent på i 1903.
	www.mik.dk /Laesesalon/Biografier/Politik_og_Erhverv/Poulsen_Valdemar.aspx (441 words)

	V. Poulsens Kapel - Main
		We had a good laugh at all this, and fresh from under the duvet, in no time at all, we became Vagn and Valdemar Poulsen from Denmark.
		This dramatic exit was the prelude to the eventful life of V. Poulsens Kapel.
		Valdemar Poulsen accompagneret af Marcel Messervier og Yves Lambert (La Bottine Souriante).
	www.vpoulsen.dk /main_english.html (647 words)

	Valdemar Poulsen
		Abacci > Abaccipedia > Va > Valdemar Poulsen
		In 1899, Poulsen develops a Magnetic tape recorder.
		* Poulsen, Valdemar, " US661619 Method of Recordings and Reproducing Sounds or Signals".
	www.abacci.com /wikipedia/topic.aspx?cur_title=Valdemar_Poulsen (249 words)

Try your search on: Qwika (all wikis)