Cathode-ray tube - Factbites

Cathode-ray tube - Factbites
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Topic: Cathode-ray tube

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	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).
		Cathode rays were first produced by Geissler tubes.
		Cathode rays are streams of electrons observed in vacuum tubes, i.e.
	en.wikipedia.org /wiki/Cathode_ray (384 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)

	Mysterious Rays
		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.
		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.
		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
		The tube itself is glass and coated inside with a black graphite conducting paint, which is connected to one of three anodes.
		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.
		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.
		It is ironic that although the vacuum tube industry has been reduced to a mere shadow of what it was in the early days of electronics, the CRT, the sole volume survivor of the vacuum tube days, appears as though it will be with us for many years to come.
		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.
	www.montest.com /mon-apps.html (1626 words)

	ChemTeam: Cathode Ray Tube History
		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.
		1876 Eugen Goldstein shows that the radiation in a vacuum tube produced when an electric current is forced through the tube starts at the cathode; Goldstein introduces the term cathode ray to describe the light emitted.
		1855 German inventor Heinrich Geissler develops mercury pump - produces first good vacuum tubes, these tubes, as modified by Sir William Crookes, become the first to produce cathode rays, leading eventually to the discovery of the electron (and a bit farther down the road to television).
	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)

	cathode-ray tube on Encyclopedia.com
		CATHODE-RAY TUBE [cathode-ray tube] special-purpose electron tube in which electrons are accelerated by high-voltage anodes, formed into a beam by focusing electrodes, and projected toward a phosphorescent screen that forms one face of the tube.
		Cathode-ray tubes are used in television sets, computer monitors, automated teller machines, oscilloscopes, and radar displays.
		Some cathode-ray tubes can produce multiple beams of electrons and have phosphor screens that are capable of displaying more than one color.
	www.encyclopedia.com /html/c1/cathoder.asp (286 words)

	CATHODE RAY TUBE MANUFACTURING AND RECYCLING:
		The CRT glass industry’s ability to limit the use of lead in the manufacturer of new CRTs is a significant contribution to the electronic industry’s overall effort to reduce the use of substances of concern, and therefore the environmental impact of electronics manufacturing and the end-of-life electronics recycling and disposal.
		CRT glass manufacturers have a high degree of confidence as to the composition of this recycled cullet since they know the glass was produced by their facility.
		The average CRT for the time period 1995 to 2000, including televisions and monitors, is an 18.63-inch CRT with a lead content that varies from 2.14 lbs to 2.63 lbs.
	www.nsc.org /ehc/epr2/nardone/nardone.htm (4809 words)

	USATODAY.com - Koreans try to save cathode-ray tube
		The South Korean manufacturer is referring to cathode-ray tube, or CRT, televisions &; the heavy boxes that have dominated the business since television was introduced at the New York World's Fair in 1939.
		CRTs — which some videophiles insist produce the best pictures — use a gun that fires electrons in a heavy, glass tube to light phosphors, far different from flat-panel TVs.
		Yet Samsung and a South Korean rival, LG Electronics Co., are refusing to abandon the old-style tube TVs entirely.
	www.usatoday.com /tech/products/gear/2005-08-14-koreans-cathode_x.htm (953 words)

	Science Projects - Tesla Coil, Laser, Cathode Ray Tube
		The cathode ray tube is a vacuum tube, produced without a vacuum pump, and it's made from only a 1/2" dia.
		Flying home, I put the tube together in less than 10 minutes, hooked it up to the Tesla Coil and a strangely blue eerie glow was dancing through the tube and I could plainly see the Faraday dark space at the cathode.
		Laser radiation is produced when a gas discharge tube is highly evacuated and then filled with gas, placed between two mirrors forming a resonant optical cavity.
	www.primeline-america.com /bckps/pages/science (802 words)

	ChemTeam: Cathode Ray Tube Results
		There were a number of results gathered over the years by cathode ray tube researchers.
		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.
	dbhs.wvusd.k12.ca.us /webdocs/AtomicStructure/Disc-of-Electron-Results.html (589 words)

	Cathode Ray Tube
		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.
		He was to eventually declare that these mysterious "cathode rays" were actually beams of electrons, small building blocks of matter.
		The cathode is the negative electrode from which the electrons originate.
	online.cctt.org /physicslab/content/Phy2HON/lessonnotes/modern/electronbeams.asp (277 words)

	BBC News UK R.I.P. Cathode ray tube monitor
		However, tiring of the fusty confines of academia in the roaring 1920s, CRT began what was to prove a lifelong affair with showbiz in the form of television.
		In its youth, CRT devoted its considerable energies to the pursuit of empirical scientific knowledge, primarily acting as an oscilloscope to give electric signals a visible representation.
		Before that relationship could be consummated, CRT was called up to military service at the outbreak of hostilities in 1939.
	news.bbc.co.uk /hi/english/uk/newsid_1459000/1459817.stm (586 words)

	Teralab - Glass Blowing - Cathode Ray Tube
		Modern cathode ray tubes have a heated cathode, which releases large numbers of electrons.
		I found that the tube then had to be inverted with the bulb uppermost, because the alcohol condensed in the tube.
		This tube works in a different way and as a result is much simpler to construct.
	www.teralab.co.uk /Glass_Blowing/CRT_A/CRT_A_Page1.htm (752 words)

	Science Museum London - Treasures
		One of the original vacuum tubes used in experiments designed by J J Thomson, Professor of Physics at the Cavendish Laboratory of the University of Cambridge, England, to measure the ratio of the electric charge carried by cathode rays to their mass.
		J J Thomson with a cathode-ray tube, 1897.
		Thomson showed that cathode rays were streams of particles, not electromagnetic radiation as many other scientists believed.
	www.sciencemuseum.org.uk /on-line/treasure/objects/1901-51.asp (120 words)

	Define cathode ray tube - a Whatis.com definition - see also: CRT
		A cathode ray tube consists of several basic components, as illustrated below.
		A cathode ray tube (CRT) is a specialized
		The CRT in a computer display is similar to the "picture tube" in a television receiver.
	whatis.techtarget.com /definition/0,,sid9_gci213839,00.html (418 words)

	cathode-ray tube
		the three essential theoretical foundations which underlie the philosophy of cathode-ray tube explained
	www.cathoderaytube.homestead.com (13 words)

	Image Dissector Iconoscope Monoscope tubes
		Thus an electron image extends through the space of the tube and is brought to focus in a plane which passes through the aperture.
		Instead there is a ring of conductive material inside the tube, connected to the mosaic, and a ring of conductive material outside the tube with a signal connection.
		Electrons emitted from the remaining portion of the tube are wasted, rather than stored on the target as in the image orthicon.
	www.aade.com /tubepedia/1collection/tubepedia.htm (809 words)

	Cathode Ray Tube
		A cathode ray tube produces a beam of electrons which can be seen as it hits a phosphorescent surface inside the tube.
		Holding a magnet close to the CRT parallel to the table so that it produces a horizontal magnetic field inside the tube causes the electron beam to deflect up or down.
		Inside the tube is a pair of parallel electric plates.
	www.physics.brown.edu /physics/demopages/Demo/modern/demo/7b3510.htm (98 words)

	The Cathode Ray Tube site, old electronic glassware.
		He developed the first cold Cathode Ray tube with beam deflection and a phosphor screen to produce a visible beam.
		Braun used this tube in 1897 for development of the first oscilloscope, for studying the effects of Cathode rays.
		In 1928, Belin and Holweck used Cathode rays for their TV receiver and demonstrated it in Malmaison.
	members.chello.nl /~h.dijkstra19/page3.html (489 words)

	Cathode Ray Tube
		It may seem mundane to us today, but to audiences at popular scientific lectures, the glow in this simple cathode tube was eerie, and to physicists it presented a challenging mystery.
	www.aip.org /history/electron/jjcathtu.htm (31 words)

	Sphere's Cathode Ray Tube - CRT Page
		These are the cathode ray tubes (CRT's) we have on hand from RCA, Dumont, Sylvania, SONY, Telefunken, Philips and other key makers.
		These are new tubes, still with the QC sticker on the face, filament checked, all good.
		This is a high end tube, with neck deflection contacts, should be high bandwidth.
	www.sphere.bc.ca /test/crts.html (1499 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)

	Fathom :: The Source for Online Learning
		With the help of his assistant Everett, he constructed special cathode ray tubes that enabled him to study how the paths of the rays are affected by electric and magnetic fields.
		'JJ' Thomson invented the cathode ray tube and with this, was able in 1899 to prove the existence of the first sub-atomic particle--the electron.
		But he certainly was not and two years later he went further and suggested that cathode rays were indeed particles, each with a definite charge and mass (his values for both turned out to be quite accurate).
	www.fathom.com /feature/122306 (870 words)

	CGTalk - Cathode Ray Tube
		The cathode ray tube is a sealed glass tube from which most of the air has been removed.....(snip)....
		A thin piece of metal coated with a material that emits light when struck by electrons is sealed inside the tube to detect the path of the electrons.
		Does anyone have any suggestions for making the gas inside the tube?
	forums.cgsociety.org /showthread.php?t=98796 (386 words)

	Slimmer tube TVs to challenge flat panels Tech News on ZDNet
		Executives at a display conference here said Thursday that significantly thinner CRT (cathode ray tube) displays will be available next year and are expected to be less expensive than trendy flat panels that use newer technologies such as LCD--liquid crystal display--and plasma displays.
		LG.Philips Displays is already making the tubes for the thin models in limited quantities and expects thin CRT televisions to be available in the United States starting in late 2005.
		Despite the growth of flat-panel televisions based on new technologies such as LCD and plasma, CRT is still expected to dominate the market in the years to come.
	news.zdnet.com /2100-1040_22-5458670.html (900 words)

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In the News (Fri 25 Jul 08)