Cathode-ray - Factbites

Cathode-ray - Factbites
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Topic: Cathode-ray

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	Cathode ray - Wikipedia, the free encyclopedia
		Cathode rays propagate in a straight line in the absence of external influences, but are deflected by electric or magnetic fields (which can be produced by placing high-voltage electrodes or magnets outside the vacuum tube - this explains the effect of magnets on a TV screen).
		It was soon understood that cathode rays consist of the actual carriers of electricity which are now known as electrons.
		Cathode rays were first produced by Geissler tubes.
	en.wikipedia.org /wiki/Cathode_ray (392 words)

	Cathode ray tube - Wikipedia, the free encyclopedia
		Cathode rays exist in the form of streams of high speed electrons emitted from the heating of cathode inside a vacuum tube.
		The cathode ray tube or CRT, invented by Karl Ferdinand Braun, is the display device that was traditionally used in most computer displays, video monitors, televisions and oscilloscopes.
		The first version to use a hot cathode was developed by J. Johnson (who gave his name to the term Johnson noise) and H. Weinhart of Western Electric and became a commercial product in 1922.
	en.wikipedia.org /wiki/Cathode_ray_tube (2148 words)

	Mysterious Rays
		Cathode rays are not only material particles, he suggested, but in fact the building blocks of the atom: they are the long-sought basic unit of all matter in the universe.
		But when the German physicist Heinrich Hertz passed the rays through an electric field created by metal plates inside a cathode ray tube, the rays were not deflected in the way that would be expected of electrically charged particles.
		When Lenard passed cathode rays through a metal foil and measured how far they traveled through various gases, he concluded that if these were particles, they had to be very small.
	www.aip.org /history/electron/jjrays.htm (451 words)

	Cathode_Ray_Tubes
		The cathode rays from the hemispherical cathode are focussed on a thin piece of platinum held above it by a glass arm.
		Cathode ray tubes are the product of two 19th century technologies: high vacuum and high voltage.
		The beam of cathode rays collides with a paddle wheel whose axle runs on parallel glass rails inside the tube, and causes it to spin.
	physics.kenyon.edu /EarlyApparatus/Electricity/Cathode_Ray_Tubes/Cathode_Ray_Tubes.html (380 words)

	Three Experiments and One Big Idea
		Either the cathode rays carried an enormous charge (as compared with a charged atom), or else they were amazingly light relative to their charge.
		Experimenting on how cathode rays penetrate gases, he showed that if cathode rays were particles they had to have a very small mass--far smaller than the mass of any atom.
		As Thomson saw it, the negative charge and the cathode rays must somehow be stuck together: you cannot separate the charge from the rays.
	www.aip.org /history/electron/jj1897.htm (549 words)

	ChemTeam: Cathode Ray Tube History
		As concerning the nature of the cathode ray, the Germans tended to the explanation that cathode rays were a wave (like light), whereas the British tended to believe that the cathode ray was a particle.
		This was in response to the prediction by Lenard that cathode rays would move with the velocity of light.
		1858 Julius Plücker shows that cathode rays bend under the influence of a magnet suggesting that they are connected in some way; this leads in 1897 to discovery that cathode rays are composed of electrons.
	dbhs.wvusd.k12.ca.us /webdocs/AtomicStructure/Disc-of-Electron-History.html (799 words)

	Cathode Ray Tube
		He was to eventually declare that these mysterious "cathode rays" were actually beams of electrons, small building blocks of matter.
		Scientists had discovered as early as the 1850's that when a magnet was held up next to the cathode ray tube, the beam would be deflected.
		The cathode ray tube is a sealed, evacuated glass tube.
	online.cctt.org /physicslab/content/Phy2HON/lessonnotes/modern/electronbeams.asp (277 words)

	cathode-ray tube on Encyclopedia.com
		Researchers Are Preparing Scanning Laser Displays to Challenge Cathode Ray Tubes, According to a New Futuretech Briefing Published by Technical Insights.
		Stanford Resources Forecasts Cathode Ray Tube Market to Grow 4% Despite Pressures From Flat Panel Displays.
		EU Approves Philips-LG Plans to Merge Cathode Ray Tube Businesses.
	www.encyclopedia.com /html/c1/cathoder.asp (483 words)

	Cathode-Ray Oscilloscope
		The cathode ray is a beam of electrons which are emitted by the heated cathode (negative electrode) and accelerated toward the fluorescent screen.
		The heart of the CRO is a cathode-ray tube shown schematically in Fig.
		The assembly of the cathode, intensity grid, focus grid, and accelerating anode (positive electrode) is called an electron gun.
	boson.physics.sc.edu /~hoskins/Demos/CathodeRay.html (1876 words)

	The cathode-ray tube (CRT)
		The cathode of the electron gun in the CRT is required not only to emit electrons, but also to concentrate emitted electrons into a tight beam.
		In the electron tubes that you have studied, the cathode was cylindrical and emitted electrons in all directions along its entire length.
		The number of electrons that leave the area of the cathode is determined by the cap-shaped grid.
	www.tpub.com /neets/book6/21e.htm (1569 words)

	Cathode Ray Tubes (CRTs)
		Cathode Ray Tubes (CRTs) are found in most conventional TV and computer monitors.
		Because each cathode ray tube contains approximately five to seven pounds of lead as well as other hazardous constituents, discarded monitors and televisions are subject to California hazardous waste regulations administered by the Department of Toxic Substances Control (DTSC).
		The California Department of Toxics and Substance Control (DTSC) has stated that the material in Cathode Ray Tubes is hazardous and that CRTs are banned from California municipal landfills.
	r4.ucdavis.edu /services/crt/crt.htm (552 words)

	Cathode ray tube - Wikipedia, the free encyclopedia
		Cathode rays exist in the form of streams of high speed electrons emitted from the heating of cathode inside a vacuum tube.
		The earliest version of the CRT was a cold-cathode diode, a modification of the Crookes tube with a phosphor-coated screen, sometimes called a Braun tube.
		The tube for this kind of use is longer and narrower, and deflection is done by applying an electrical field via deflection plates built into the tube's neck.
	en.wikipedia.org /wiki/Cathode_ray_tube (2244 words)

	Cathode ray - Wikipedia, the free encyclopedia
		Cathode rays propagate in a straight line in the absence of external influences, but are deflected by electric or magnetic fields (which can be produced by placing high-voltage electrodes or magnets outside the vacuum tube - this explains the effect of magnets on a TV screen).
		It was soon understood that cathode rays consist of the actual carriers of electricity which are now known as electrons.
		Cathode rays are streams of electrons observed in vacuum tubes, i.e.
	en.wikipedia.org /wiki/Cathode_ray (384 words)

	ChemTeam: Cathode Ray Tube Results
		The cathode rays bend toward the positive pole, confirming that cathode rays is negatively charged.
		Thomson had developed formulas based on the deflection of the cathode ray by the electric field and by the magnetic field.
		There were a number of results gathered over the years by cathode ray tube researchers.
	dbhs.wvusd.k12.ca.us /webdocs/AtomicStructure/Disc-of-Electron-Results.html (589 words)

	Recycling Cathode Ray Tubes (CRTs)
		A Cathode Ray Tube, abbreviated “CRT”, is the main component in a television and computer monitors display unit.
		Effective April 1, 2000 Massachusetts imposed a ban on the disposal, incineration, or transfer for disposal, of Cathode Ray Tubes at a solid waste disposal facility.
		Computer Monitor and Television Set (Cathode Ray Tubes) Recyclers Listing:
	www.wastecap.org /wastecap/commodities/crt/crt.htm (996 words)

	cathode ray tube from FOLDOC
		A large glass envelope containing a negative electrode (the cathode) emits electrons (formerly called "cathode rays") when heated, as in a vacuum tube.
		The electrons are accelerated across a large voltage gradient toward the flat surface of the tube (the screen) which is covered with phosphor.
		CRTs also differ in their dot pitch, which determines their spatial resolution, and in whether they use interlace or not.
	foldoc.org /?cathode+ray+tube (235 words)

	Tesla coil science fair project plan & plans for building a cathode ray & laser.
		The cathode ray tube is a vacuum tube, produced without a vacuum pump, and it's made from only a 1/2" dia.
		Tesla coil science fair project plan and instructions for building a cathode ray tube, a helium-neon laser and a plasma globe powered by the Tesla coil.
		As if the Tesla Coil wasn't enough, coupled with the cathode ray tube it was a sure winner.
	www.primeline-america.com /science (1129 words)

	cathode-ray_tube
		[n] a vacuum tube in which a hot cathode emits a beam of electrons that pass through a high voltage anode and are focused or deflected before hitting a phosphorescent screen.
	lookwayup.com /lwu.exe/lwu/d?s=f&w=cathode-ray_tube (31 words)

	CRT (Cathode Ray Tube) Recycling Exchange Listings
		Recovered CRT Glass shall consist of Cathode Ray Tube Glass processed and sized Must be free of cores, metal windings and other foreign materials.
		Scrap whole or broken Cathode Ray Tubes, may contain cores & windings but must be free of metal & plastic frames.
		Used TV's - CRT - CATHODE RAY TUBE ONLY.
	www.recycle.net /recycle/Glass/crt/xv091500.html (615 words)

	The Cathode Ray Oscilloscope
		The Cathode Ray Oscilloscope is menu-driven and easy to use.
		Now you can prepare your students for their first electronics lab with Cathode Ray Oscilloscope.
		As a tutoring environment for students Ray is unequaled."
	webassign.net /pas/cathode_ray_oscilloscope/cro.html (322 words)

	The Cathode Ray Tube site, old electronic glassware.
		The Cathode Ray Tube site is not responsible for the practices or the content of such websites.
		Links to the Cathode Ray Tube site are encouraged and do not require permission, although notification would be appreciated.
		The Cathode Ray Tube site, old electronic glassware.
	members.chello.nl /~h.dijkstra19 (249 words)

	Mysterious Rays
		Cathode rays are not only material particles, he suggested, but in fact the building blocks of the atom: they are the long-sought basic unit of all matter in the universe.
		But when the German physicist Heinrich Hertz passed the rays through an electric field created by metal plates inside a cathode ray tube, the rays were not deflected in the way that would be expected of electrically charged particles.
		When Lenard passed cathode rays through a metal foil and measured how far they traveled through various gases, he concluded that if these were particles, they had to be very small.
	www.aip.org /history/electron/jjrays.htm (451 words)

	cathode-ray tube
		A heated filament heats a metal-oxide coated cathode that emits electrons which pass through a positively charged anode that is held at several thousand volts and accelerates the electrons to a high speed beam.
		The tube itself is glass and coated inside with a black graphite conducting paint, which is connected to one of three anodes.
		Vacuum tube in which a beam of electrons is produced and focused onto a fluorescent screen.
	www.tiscali.co.uk /reference/encyclopaedia/hutchinson/m0015949.html (196 words)

	Cathode-ray tube
		The cathode-ray tube (CRT) is one of the main elements of an oscilloscope.
		CRT consists of the glass bulb evacuated to a high vacuum, the cathode (a source of electrons), cathode heater, electrodes for brightness and focus control, several accelerating anodes, the pairs of horizontal and vertical capacitor plates deviating the electron beam, and fluorescing screen.
		The tubes are produced with electrostatic and electromagnetic control, where electrostatic or magnetic fields deviate the electron beam respectively.
	physics.nad.ru /Physics/English/osc_txt.htm (304 words)

	MONTEST-LCD monitor tester, Video Primer, Cathode Ray Tube CRT
		Located closest to the heated cathode is a round disc, approximately the size and the shape of a dime with a small hole in the center.
		Because of its closeness to the cathode, this control grid, when charged to a small (3-5 volt) negative potential, will deflect electrons back toward the cathode and prevent the beam from entering the focus and accelerating subsystem.
		The CRT was designed in the 1920's and although several changes have been made to the original design, the changes to the basic structure have been relatively minor.
	www.montest.com /mon-apps.html (1626 words)

	Blogcritics.org: Rescue Me Rocks, The Inside Chopped (Maybe): Cathode Ray Fray, the Week in TV, Returns
		I'll have to check in with the Ray and get back to you on that one, but the ennui at the moment is crushing me to my very soul.
		I'd rather go to hell and starve, thanks) there were several that caught my attention and, under the Ray's patient tutelage, keep a vigilant eye upon still.
		It's nice to see that the Ray was remembered, if only by one person!
	blogcritics.org /archives/2005/08/12/161058.php (1350 words)

	Small Cathode Ray tubes to 2 inches
		RCA 2AP1 2" Cathode Ray Tube for oscilloscope applications.
		RCA 913 1" Cathode Ray Tube for oscilloscope applications.
		RCA 902 2" Cathode Ray Tube for oscilloscope applications.
	www.aade.com /tubepedia/1collection/tubepedia2.htm (136 words)

	ChemTeam: Cathode Ray Tube History
		As concerning the nature of the cathode ray, the Germans tended to the explanation that cathode rays were a wave (like light), whereas the British tended to believe that the cathode ray was a particle.
		Philipp von Lenard develops a cathode-ray tube with a thin aluminum window that permits the rays to escape, allowing the rays to be studied in the open air.
		This was in response to the prediction by Lenard that cathode rays would move with the velocity of light.
	dbhs.wvusd.k12.ca.us /webdocs/AtomicStructure/Disc-of-Electron-History.html (799 words)

	Cathode Ray Tube
		Tube The cathode ray tube is a sealed glass tube from which most of the air has been removed.
		Glass tube A piece of glass that connects the cathode ray tube to the stand.
		Click on part of the cathode ray tube to see a description of that part.
	dwb.unl.edu /Teacher/NSF/C03/C03Links/www.chem.uiuc.edu/demos/cathode.html (178 words)

	Electronics 29
		The cathode-ray tube oscilloscope is an experiment that I had thought was beyond the scope of these pages, mainly because of the cost and difficulty of obtaining the components.
		The common picture tube is a CRT with magnetic focussing and deflection, often containing three electron beams that are directed to separate phosphor spots to display different colors, and which are modulated to display different intensities.
		The portion of the tube from the deflecting plates to the screen is accessible, so that a solenoid can be slipped over the end of the tube for possible experiments, such as the determination of e/m.
	www.du.edu /~etuttle/electron/elect29.htm (2546 words)

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Topic: Cathode-ray

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In the News (Tue 29 Dec 09)