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Topic: Van de Graaff generator

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Van de Graaf generator

Robert Van de Graaff

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	Van de Graaff generator at AllExperts
		The Van de Graaff generator can be thought of as a constant-current source connected in parallel with a capacitor and a very large electrical resistance.
		A simple Van de Graaff generator consists of a belt of silk, or a similar flexible dielectric material, running over two pulleys, one of which is surrounded by a hollow metal sphere.
		Van de Graaff applied for a patent in December 1931, which was assigned to MIT in exchange for a share of net income.
	en.allexperts.com /e/v/va/van_de_graaff_generator.htm (1260 words)

	Van de Graaff generator - Wikipedia, the free encyclopedia
		The Van de Graaff generator can be thought of as a constant-current source connected in parallel with a capacitor and a very large electrical resistance.
		Van de Graaff applied for a patent in December 1931, which was assigned to MIT in exchange for a share of net income.
		In 1933 Van de Graaff built a 40-foot (12 m) model at MIT's Round Hill facility, the use of which was donated by Colonel Green.
	en.wikipedia.org /wiki/Van_de_Graaff_generator (1175 words)

	Robert J. Van de Graaff - Wikipedia, the free encyclopedia
		Robert Jemison Van de Graaff, (December 20, 1901 -- January 16, 1967) was an American physicist and instrument maker, and professor of physics at Princeton University.
		Van de Graaff was born in Tuscaloosa, Alabama.
		He was the designer of the Van de Graaff generator, a device which produces high voltages.
	en.wikipedia.org /wiki/Robert_J._Van_de_Graaff (350 words)

	Van de Graaff (Site not responding. Last check: 2007-10-18)
		Robert Jemison Van de Graaff was born on December 20, 1901 in Tuscaloosa, Alabama.
		In Van de Graaff generators, electric charge is transported to the high-voltage terminal on a rapidly moving belt of insulating material driven by a pulley mounted on the grounded end of the structure; a second pulley is enclosed within the large, spherical high- voltage terminal, as shown at left.
		Van de Graaff also worked with John G. Trump, a professor of electrical engineering at MIT and with William W. Buechner, a professor of physics at MIT in an effort to achieve higher voltages, more homogeneous particle beams, and more compact designs.
	chem.ch.huji.ac.il /~eugeniik/history/graaff.html (2196 words)

	The Van de Graaff Generator (Site not responding. Last check: 2007-10-18)
		The electrostatic machine known as the Van de Graaff generator was invented by Robert J. Van de Graaff, in the USA, by 1929, with the objective of generating high voltages for experiments in nuclear physics.
		After the initial experiments with generators operating in air, high-power Van de Graaff generators were built, operating in tanks of compressed air, and later other gases, achieving several megavolts of output voltage and much higher output current than would be possible in the basic machine [p98].
		The Van de Graaff generator is common in a variety of tabletop models for demonstrations and experiments with electrostatics, usually in unipolar configuration.
	www.coe.ufrj.br /~acmq/myvdg.html (2951 words)

	Physics Q & A - Van de Graaff generator
		Van de Graaff generator was invented by the American scientist Robert J. Van de Graaff (1901- 1967) in 1931.
		Van de Graaff generator can produce a voltage of over 10 million volts on its spherical cover.
		When a small grounded metal ball is placed close to the spherical cover of the generator, the strong electric field will cause the charge to leap towards the ball, producing a large amount of ions and electrons in air.
	www.hk-phy.org /iq/van_de_graaff/van_de_graaff_e.html (631 words)

	Generateur electrostatique Van de Graaff
		Son inventeur est le Dr Robert Van de Graaff (biographie, histoire) qui cherchait a produire de l'electricite statique a tres haute tension dans les annees 1931-1933.(Brevet US 1.991.236) C'est a l'Universite de Princeton, dans le New Jersey que cet outil scientifique (Statitron) a ete conçu et realise par MM.
		Van de Graaff was looking for a way of creating a direct current, high voltage power source.
		The generator consists of a well rounded high voltage terminal isolated from ground on an insulating column, and a charge conveying system consisting of one or more flat endlessbelts of insulating material running between this terminal and ground.
	members.aol.com /lyonelb/vdg.html (1268 words)

	Work against an Electric Force (Site not responding. Last check: 2007-10-18)
		The situation is therefore somewhat similar to Robert Van de Graaff's machine, except that there the rubber band overcomes electric repulsion, while here, the forces of the wind and of gravity overcome an attraction.
		The way electric charge is sprayed from a high-voltage source onto the belt of the Van de Graaff generator is also at the heart of the xerographic copier or "xerox machine." In both terms, the prefix "xero-" comes from the Greek word for "dry," implying a printing process using dry ink.
		Van de Graaff's was honored by having one of the craters on the far side of the Moon named for him.
	www.phy6.org /stargaze/Svandgrf.htm (1875 words)

	Van de Graaff Generator - Picture - MSN Encarta
		Van de Graaff Generator - Picture - MSN Encarta
		Van de Graaff generators can build up very high charges of static electricity.
		As this girl touches a generator, her body becomes charged along with the generator.
	encarta.msn.com /media_701639183/Van_de_Graaff_Generator.html (52 words)

	Work against an Electric Force
		The situation is therefore somewhat similar to Robert Van de Graaff's machine, except that there the rubber band overcomes electric repulsion, while here, the forces of the wind and of gravity overcome an attraction.
		The way electric charge is sprayed from a high-voltage source onto the belt of the Van de Graaff generator is also at the heart of the xerographic copier or "xerox machine." In both terms, the prefix "xero-" comes from the Greek word for "dry," implying a printing process using dry ink.
		Van de Graaff's was honored by having one of the craters on the far side of the Moon named for him.
	www-istp.gsfc.nasa.gov /stargaze/Svandgrf.htm (1875 words)

	Van de Graaff Generator, 1933: Exhibits: Institute Archives & Special Collections: MIT
		Known colloquially as the “Van de Graaff Generator,” the apparatus was designed to supply high voltage to accelerate subatomic particles to very high velocities for the bombardment and study of atomic nuclei.
		President Karl T. Compton brought Robert J. Van de Graaff to MIT from Princeton in 1931 to bolster the Institute's physics department and develop a much-needed facility for high-voltage research.
		Reports, correspondence, photos, and other materials relating to the Van de Graaff Generator are located in the Records of the MIT President (AC 4), the Papers of Robert J. Van de Graaff (MC 45), and the Records of the High Voltage Energy Corporation (MC 153) at the MIT Institute Archives and Special Collections.
	libraries.mit.edu /archives/exhibits/van-de-graaff (416 words)

	electrostatic generator - Hutchinson encyclopedia article about electrostatic generator (Site not responding. Last check: 2007-10-18)
		US physicist Robert Jemison van de Graaff developed this high-powered generator, which can produce more than a million volts.
		Experiments involving high-energy charged particles make use of a van de Graaff generator, generally for the initial acceleration of the particles, which are then passed to more powerful accelerators.
		The size of the voltage built up in air depends on the radius of the sphere, but can be increased by enclosing the generator in an inert atmosphere, such as nitrogen.
	encyclopedia.farlex.com /electrostatic+generator (193 words)

	The Van de Graaff generator
		All Van de Graaff machines for research and industrial purposes came to be enclosed in a (vertical or horizontal) cylindrical or cigar-shaped pressure tank, a departure from the typical column-and-sphere design.
		The voltage is generated by an endless-belt which is in a column (or horizontal tube) with equipotential rings whose open terminals are grounded while the cylindrical collector in the middle of the column is brought to a high voltage (we imagine +) by the charges carried by the belt.
		If the Van de Graaff generator continues to have a brilliant career in the field of high energy physics, astrophysics and in several industrial applications as research and professional apparatus, in its simplest form it also proves to be extremely popular as didactic instrument.
	members.aol.com /lyonelb/sis.html (6637 words)

	Arbor Scientific Online! - Van de Graaff Generator 220 Volt European Plug (Site not responding. Last check: 2007-10-18)
		Generator provides power for all basic electrostatic experiments on a dramatic scale, with sparks of 8" to as high as 12" to 15".
		First, the P6-3300 Van de Graaff generator is not a huge machine, so the smaller the person you have selected, the better.
		When brought near the dome of the Van de Graaff generator, the whirl discharges to the air and spins rapidly in a direction that is away from the points.
	www.arborsci.com /detail.aspx?ID=906 (475 words)

	5A50.30 Van de Graaff Generator (Site not responding. Last check: 2007-10-18)
		Simon, On the Theory of the Van de Graaff Electrostatic Generator, AJP 22, 318-326 (1952).
		Subudhi and P. Tiwari, Comparison of Simon's and Van de Graaff's Theories of the Electrostatic Generator, AJP 30, 333-335 (1962).
		Simon, Theory of the frictional Van de Graaff electrostatic generator, AJP 43, 1108-1110 (1975).
	www.physics.brown.edu /physics/demopages/Demo/em/demo/5a5030.htm (243 words)

	Van De Graaff Generator - Uncyclopedia, the content-free encyclopedia
		The Van De Graaff generator is a device that uses a combination of old toothbrush bristles, a band of silk and happy thoughts to generate up to 300 MegaVolts of static electricity.
		The Van De Graaff Generator was invented in 1794 by Robert J. Van de Graaff (1773-1809) and Martin Generator (1772-Present).
		The invention of Van De Graaff Generator would not have been possible without the previous work of Nikola Tesla and Alessandro Volta, so let's give those lads a big round of applause.
	uncyclopedia.org /wiki/Van_De_Graaff_Generator (427 words)

	Hal's Van de Graaff Generator Page
		Van de Graaff generators are a type of high-voltage electrostatic generators, created in 1929 by the American physicist and inventor Robert J. Van de Graaff.
		When the generator is operational, an electrical field of energy emanates from the sphere, which is called "ion wind".
		Since Van de Graaff generators emit direct current (DC) at very high voltages, they are extremely dangerous to anyone with a heart condition.
	www.halice.com /physics/vdg.html (898 words)

	History of the Van de Graaff Generator (Site not responding. Last check: 2007-10-18)
		The generator was generously donated to the Museum by the Massachusetts Institute of Technology.
		Finally, in 1931, the large Van de Graaff generator was constructed in an unused dirigible dock at Round Hill, the estate of Colonel E.H.R. Green, in South Dartmouth, Massachusetts.
		The colossal Van de Graaff was dismantled and brought to the Cambridge campus of MIT.
	www.mos.org /sln/toe/history.html (369 words)

	Article published in Tuscaloosa News Dec 12, 2004
		The Van de Graaff boys came by their love of football honestly; their father, Adrian Van de Graaff Sr., was virtually present at the creation of the game.
		One of the early applications of Robert’s generator, which he patented in 1935, was treating cancerous tumors with precisely penetrating radiation.
		Hargrove Van de Graaff donated property to the city to use as an airstrip.
	bama.ua.edu /~jharrell/PH106-S06/vandegraaff.htm (1920 words)

	SCIENCE HOBBYIST PAGE: VAN DE GRAAFF GENERATOR FAQ
		A Van de Graaff machine is a mechanical-electric device which produces extremely high voltage at low, safe levels of electric current.
		A: The VDG machine was invented in the 1920s by Robert Van de Graaff, an MIT physics student who was inspired by large, unexplained sparks produced by an industrial printing press.
		The Van de Graaff machine is an excellent device for studying Electrostatics, the science of voltage and electric charge.
	amasci.com /emotor/vdgdesc.html (2859 words)

	A simple homemade Van de Graaff generator
		The shaft of the motor can be left bare, but the generator will work a little better if it is made fatter by wrapping tape around it, or (better) putting a plastic rod with a hole in the center onto the shaft to act as a pulley for the rubber band.
		To use our generator to power the Franklin's Bells we built in the previous section of the book, clip the bottom brush wire to one "bell", and attach a wire to the top of the generator, connecting it to the other "bell".
		The high voltage source can be the Van de Graaff generator, or just a couple square feet of aluminum foil pressed against the front of your television set, as we did in earlier projects.
	members.fortunecity.com /freeenergy2000/asimplevandegraf.htm (3291 words)

	Science Center, Van de Graaff Generator
		Voltages of hundreds of thousands of volts can be generated with a demonstration model Van de Graaff generator.
		Though startling, discharges from the Van de Graaff do not represent a serious shock hazard since the currents attainable are so small.
		The plastic bowl is attached to the Van de Graaff dome with masking tape so that it doesn't fly off.
	www.simplot.com /education_council/van_de_graaff_generator.cfm (226 words)

	SF-9722 Van de Graaff Generator - PASCO scientific
		The PASCO Van de Graaff Generator is rugged, reliable and produces sparks up to 10 cm long.
		The 59 cm high generator includes a variable speed motor and a 22 cm diameter aluminum sphere with banana jack at the top for an electric whirl.
		One common misconception about Van de Graaff generators is that they merely transform electricity from the wall socket to high voltage electricity at the aluminum sphere.
	store.pasco.com /pascostore/showdetl.cfm?&DID=9&Product_ID=51864&CATID=35&Detail=1 (208 words)

	The PYRO-ENERGEN, Van de Graaff Static Generator, and Lightning
		The PYRO-ENERGEN, Van de Graaff generator, and lightning are all in the category of electrostatic mechanism.
		Van de Graaff generator is a mechanical static electricity generator which can produce several thousands of high voltage to make your hair stand when you are near the machine.
		Van de Graaff generator is used for experimentation in Physics as well as other societies.
	www.pyroenergen.com /articles/van-de-graaff.htm (1380 words)

	SCIENCE HOBBYIST PAGE: VAN DE GRAAFF GENERATOR FAQ
		A Van de Graaff machine is a mechanical-electric device which produces extremely high voltage at low, safe levels of electric current.
		A: The VDG machine was invented in the 1920s by Robert Van de Graaff, an MIT physics student who was inspired by large, unexplained sparks produced by an industrial printing press.
		The Van de Graaff machine is an excellent device for studying Electrostatics, the science of voltage and electric charge.
	www.eskimo.com /~billb/emotor/vdgdesc.html (2859 words)

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