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electromagnetic

electromagnetic

electromagnetic Sentence Examples

  • The air was charged by the activated electromagnetic field surrounding the compound.

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  • We intercepted some emergency transmissions but couldn't get everything because of the electromagnetic field.

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  • Electromagnetic voltmeters consist of a coil of fine wire connected to the terminals of the instrument, and the current produced in that wire by a difference of potential between the terminals creates a magnetic field proportional at any point to the strength of the current.

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  • Function of receive antenna is extraction energy from electromagnetic field.

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  • Electromagnetic Ammeters.

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  • 30 be numerically the same as the ratio of the electromagnetic and electrostatic units.

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  • In particular, he found that the calculated velocity with which it transmitted electromagnetic disturbances was equal to the observed velocity of light; hence he was led to believe, not only that his medium and the ether were one and the same, but, further, that light itself was an electromagnetic phenomenon.

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  • With the former Supreme Commander of the Armed Forces and the Special Assistant to the VP, not to mention the biofields, electromagnetic fields, and other beefed security measures, the compound at the top of the mountain was a fortress commanded by the President's own right-hand man.

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  • It was an electrostatic and electromagnetic machine combined, driven by an electric current and producing in turn electrostatic charges of electricity.

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  • The step to magnetic phenomena was comparatively simple; but it was otherwise as regards electromagnetic phenomena, where current electricity is essentially involved.

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  • The principal object of this more recent research has been the determination of the quantitative amount of chemical change associated with the passage for a given time of a current of strength known in electromagnetic units.

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  • The principal object of this more recent research has been the determination of the quantitative amount of chemical change associated with the passage for a given time of a current of strength known in electromagnetic units.

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  • In this case a highresistance wire is connected between the points of which the potential difference is required, and from some known fraction of this resistance wires are brought to an electrostatic voltmeter, or to a movable coil electromagnetic voltmeter, according as the voltage to be measured is alternating or continuous.

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  • Brady could've lost it in the river, but she should still pick up some electromagnetic fluctuation, if he was anywhere except the bottom of the river.

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  • The Galitzin seismograph, devised by Prince Galitzin, is of the same type, but it essentially differs from the Milne instrument in having its pendulum dead-beat; this is brought about by an electromagnetic device.

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  • In 1821 Michael Faraday (1791-1867), who was destined later on to do so much for the science of electricity, discovered electromagnetic rotation, having succeeded in causing a wire conveying a voltaic current to rotate continuously round the pole of a permanent magnet.

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  • for 1865, entitled " A Dynamical Theory of the Electromagnetic Field."

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  • Between 1882 and 1889 a series of papers on certain points in the electromagnetic theory of light and its relation to the various elastic solid theories appeared in the American Journal of Science, and his last work, Elementary Principles in Statistical Mechanics, was issued in 1902.

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  • At the age of nineteen he invented an electromagnetic engine, and in the course of examining its performance dissatisfaction with vague and arbitrary methods of specifying elec rical quantities caused him to adopt a convenient and scie tific unit, which he took to be the amount of electricity req ired to decompose nine grains of water in one hour.

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  • He touched his net implant but found the network scrambled, indicating the jets were sending out electromagnetic pulses in addition to the missile strikes.

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  • On the electromagnetic theory, the problem of diffraction becomes definite when the properties of the obstacle are laid down.

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  • In 1831 Faraday began the investigations on electromagnetic induction which proved more fertile in far-reaching practical consequences than any of those which even his genius gave to the world.

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  • A much better form of electromagnetic ammeter can be constructed on a principle now extensively employed, which consists in pivoting in the strong field of a permanent magnet a small coil through which a part of the current to be measured is sent.

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  • When there is no current the shutter covers the perforations and no light passes, but when a current traverses the wires they are depressed by electromagnetic action, carrying the shutter with them, and a quantity of light proportional to the current strength is admitted through the perforations.

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  • indicator, suitably supported, a to-and-fro motion was recorder given by the electromagnetic actions due to the electric currents constituting the signals.

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  • P. Drude has obtained a similar formula based on the electromagnetic theory, thus placing the theory of dispersion on a much more satisfactory basis.

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  • He not only collected the facts concerning electromagnetic induction so industriously that nothing of importance remained for future discovery, and embraced them all in one law of exquisite simplicity, but he introduced his famous conception of lines of force which changed entirely the mode of regarding electrical phenomena.

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  • Popoff employed an electromagnetic tapper, in fact the mechanism of an electric bell with the gong removed, for this purpose.

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  • Dolbear, 2 the effects were produced by electrostatic instead of electromagnetic forces, as in con- the Bell telephone.

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  • In 1849 he contributed to the Comptes Rendus a description of an electromagnetic regulator for the electric arc lamp, and, in conjunction with H.

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  • Electromagnetic voltmeters may therefore be thermal, electromagnetic or electrodynamic. As a rule, electromagnetic voltmeters are only suitable for the measurement of relatively small potentials - o to 200 or 300 volts.

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  • electromagnetic system of units will be generally adopted, and, unless otherwise stated, magnetic substances will be assumed to be isotropic, or to have the same physical properties in all directions.

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  • In its simplest form an electromagnetic ammeter consists of a circular coil of wire in which is pivoted eccentrically an index needle carrying at its lower end a small mass of iron.

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  • In order to meet the objection that the phenomenon might be due to electromagnetic action between the coil and the rod, Bidwell made some experiments with iron rings, and found that the length of their diameters varied under magnetization in precisely the same manner as the length of a straight rod.

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  • The third covers the period between 1831 and Clerk Maxwell's enunciation of the electromagnetic theory of light in 1865 and the invention of the self-exciting dynamo, which marks another great epoch in the development of the subject; and the fourth comprises the modern development of electric theory and of absolute quantitative measurements, and above all, of the applications of this knowledge in electrical engineering.

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  • This important fact laid the foundation for all subsequent inventions which finally led to the production of electromagnetic or dynamo-electric machines.

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  • Neumann in 1845 did for electromagnetic induction what Ampere did for electrodynamics, basing his researches upon the experimental laws of Lenz.

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  • If the current drive an electromagnetic engine, the reaction of the engine will produce an electromotive force opposing the current.

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  • We have seen that the efficiency of an electromagnetic engine is greatest when the current is indefinitely small, and then the rate at which it works is also indefinitely small.

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  • He caused the relay in series with the sensitive tube to set in action not only a telegraphic instrument but also the electromagnetic tapper, which was arranged so as to administer light blows on the under side of the sensitive tube when the latter passed into the conductive condition.

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  • He caused the relay in series with the sensitive tube to set in action not only a telegraphic instrument but also the electromagnetic tapper, which was arranged so as to administer light blows on the under side of the sensitive tube when the latter passed into the conductive condition.

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  • electromagnetic unit of current, this number becomes I 036 X 4.

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  • Herschel, Peter Barlow and others, but did not receive a final explanation until after the discovery of electromagnetic induction by Faraday in 1831.

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  • circuit-closing apparatus called a relay, which is practi cally an electromagnetic key which has its lever attached to the armature of the magnet and which can be worked by a very weak current.

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  • It is, of course, true for permanent magnets, where H = o, since then F = 27rI 2; but if the magnetization is due to electric currents, the formula is only applicable in the special case when the mutual action of the two magnets upon one another is supplemented by the electromagnetic attraction between separate magnetizing coils rigidly attached to them.2 The traction method was first employed by S.

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  • According to the electromagnetic theory of light K = N2, where N is the refractive index for rays of infinite wave-length.

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  • On the question of how far the effects are due to conduction between the earth plates, and how far to true electromagnetic induction, authorities differ, some being of opinion that the two effects are in operation together.

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  • In 1847 Morse was compelled to defend his invention in the courts, and successfully vindicated his claim to be called the original inventor of the electromagnetic recording telegraph.

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  • Grassot has devised a galvanometer, or " fluxmeter," which greatly alleviates the tedious operation of taking ballistic readings.2 The instrument is of the d'Arsonval type; its coil turns in a strong uniform field, and is suspended in such a manner that torsion is practically negligible, the swings of the coil being limited by damping influences, chiefly electromagnetic. The index therefore remains almost stationary at the limit of its deflection, and the deflection is approximately the same whether the change of induction occurs suddenly or gradually.

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  • The evidence for the existence of the luminiferous aether has accumulated as additional phenomena of light and other radiations have been discovered; and the properties of this medium, as deduced from the phenomena of light, have been found to be precisely those required to explain electromagnetic phenomena."

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  • The phenomena of light had compelled physicists to postulate a space-filling medium, to which the name ether had been given, and Henry and Faraday had long previously suggested the idea of an electromagnetic medium.

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  • Maxwell showed in this paper that the velocity of propagation of an electromagnetic impulse through space could also be determined by certain experimental methods which consisted in measuring the same electric quantity, capacity, resistance or potential in two ways.

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  • The two systems of measurement were called respectively the electrostatic and the electromagnetic systems (see Physical Units).

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  • Maxwell suggested new methods for the determination of this ratio of the electrostatic to the electromagnetic units, and by experiments of great ingenuity was able to show that this ratio, which is also that of the velocity of the propagation of an electromagnetic impulse through space, is identical with that of light.

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  • Experimental methods were devised for the further exact measurements of the electromagnetic velocity and numerous determinations of the dielectric constants of various solids, liquids and gases, and comparisons of these with the corresponding optical refractive indices were conducted.

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  • The accumulating determinations of the numerical value of the electromagnetic velocity (v) from the earliest made by Lord Kelvin (Sir W.

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  • After he had educated himself by the study of the phenomena of lines of magnetic force in his discoveries on electromagnetic induction, he applied the same conception to electrostatic phenomena, and thus created the notion of lines of electrostatic force and of the important function of the dielectric or non-conductor in sustaining them.

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  • Since Faraday was well aware that even a good vacuum can act as a dielectric, he recognized that the state he called dielectric polarization could not be wholly dependent upon the presence of gravitative matter, but that there must be an electromagnetic medium of a supermaterial nature.

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  • 3 X 10 24 gramme and that the unit atomic charge or natural unit of electricity is 1.3 X 1020 of an electromagnetic C.G.S.

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  • 3 X Io 2 ° of an electromagnetic unit, and the ratio of its charge to its mass is nearly 2 X 10 7 using E.M.

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  • Thomson also developed this hypothesis in a profoundly interesting manner, and we may therefore summarize very briefly the views held on the nature of electricity and matter at the beginning of the 10th century by saying that the term electricity had come to be regarded, in part at least, as a collective name for electrons, which in turn must be considered as constituents of the chemical atom, furthermore as centres of certain lines of self-locked and permanent strain existing in the universal aether or electromagnetic medium.

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  • Atoms of matter are composed of congeries of electrons and the inertia of matter is probably therefore only the inertia of the electromagnetic medium.'

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  • Heaviside, Electromagnetic Theory (London, 1893); O.

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  • He studied the phenomena of electrical oscillations from 1869 to 1871, and in the latter year he announced that the velocity of the propagation of electromagnetic induction was about 314,000 metres per second.

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  • Fitzgerald was the first to attempt to measure the length of electric waves; Helmholtz put the problem into the hands of his favourite pupil, Heinrich Hertz, and the latter finally gave an experimental demonstration of electromagnetic waves, the "Hertzian waves," on which wireless telegraphy depends, and the velocity of which is the same as that of light.

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  • Two other courses of lectures were published in volume form, Dynamo-Electric Machinery (1882), and The Electro-magnet and Electromagnetic Mechanism (1891).

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  • About the same time he devised and constructed the first electromagnetic engine with automatic polechanger (Sill.

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  • Arago had previously done on a smaller scale), where he made magnetic observations, and from this same observatory he sent telegraphic signals to the neighbouring town, thus showing the practicability of an electromagnetic telegraph.

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  • Similarly on the electromagnetic theory the electric or the magnetic force will be perpendicular to the plane of polarization, according as chemical action depends upon the electric or the magnetic energy.

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  • He also carried on extensive researches in the theory of magnetism; and it is interesting that in connexion with his observations in terrestrial magnetism he not only employed an early form of mirror galvanometer, but also, about 1833, devised a system of electromagnetic telegraphy, by which a distance of some 9000 ft.

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  • It's sort of like an electromagnetic field.

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  • The air was charged by the activated electromagnetic field surrounding the compound.

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  • With the former Supreme Commander of the Armed Forces and the Special Assistant to the VP, not to mention the biofields, electromagnetic fields, and other beefed security measures, the compound at the top of the mountain was a fortress commanded by the President's own right-hand man.

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  • We intercepted some emergency transmissions but couldn't get everything because of the electromagnetic field.

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  • There were infrastructure keypads and a few of the nuke, bio, electromagnetic, and chem keypads for the East Coast weapons systems.

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  • Brady could've lost it in the river, but she should still pick up some electromagnetic fluctuation, if he was anywhere except the bottom of the river.

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  • He touched his net implant but found the network scrambled, indicating the jets were sending out electromagnetic pulses in addition to the missile strikes.

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  • abatement measures - against electric shock or the effects of electromagnetic emissions - are also addressed in IEC standards.

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  • Through water communication using acoustic, electromagnetic and optical devices is continuing to be an active research area for us.

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  • Next on its outward journey the particle passes through a detector called the " electromagnetic calorimeter " .

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  • The entire electromagnetic calorimeter at TESLA comprises a cylinder of length 5.5m, internal radius 1.9m, and annular thickness of 20cm.

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  • Electromagnetic calorimeter (EMC) A high quality electromagnetic calorimeter is an essential feature of B A B AR.

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  • RaphaYad uses hands-on and hands-off techniques to work with the body's electromagnetic circuitry to access the body's connective pathways and neurological systems.

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  • To binge drink quot drawing its of electromagnetic waves.

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  • Electromagnetic waves of that blast reached planet earth on March 19th.

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  • electromagnetic located in.

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  • Also makes a from uranium did doubt the electromagnetic.

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  • electromagnetic radiation from mobile phones would hardly have been of use 50 years ago!

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  • electromagnetic spectrum opened for business.

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  • electromagnetic interference by UFOs has been compiled.

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  • electromagnetic calorimeter.

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  • electromagnetic compatibility is the ability of a device or system to function properly in its intended environment.

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  • electromagnetic waves are streams of photons.

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  • We have recently done pioneering experiments to demonstrate that resonant radiofrequency electromagnetic fields also affect radical reactions.

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  • Enhanced deposition of radon daughter nuclei in the vicinity of power frequency electromagnetic fields.

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  • Scattering of a plane electromagnetic wave by a perfectly conducting aircraft.

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  • The Schumann Resonance's are quasi standing wave electromagnetic waves that exist in this cavity.

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  • electromagnetic ' smog ' can affect all biological systems by disorientating their positive polarity field.

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  • electromagnetic in nature.

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  • electromagnetic spectrum known as the extreme ultraviolet.

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  • The family of electromagnetic waves from the high-frequency gamma rays to the relatively low-frequency radio waves forms what is called the electromagnetic spectrum.

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  • While control of the entire electromagnetic spectrum is impossible, key portions must be commanded at the right time.

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  • electromagnetic waves emitted by household appliances.

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  • Soft Tempest: Hidden Data Transmission Using electromagnetic emanations must be one of the more unexpected and newsworthy papers I've published.

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  • In electromagnetic terms this can be explained using the diffusion equation.

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  • faraday's law (electromagnetic) describes the generation of swirling currents in conductors, such as the non-ferrous metals in this example.

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  • Apart from the air itself, electromagnetic fields (EMFs) are the most pervasive things in our environment.

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  • hands-off techniques to work with the body's electromagnetic circuitry to access the body's connective pathways and neurological systems.

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  • inaudible waves generated by everyday electromagnetic signals can be heard.

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  • The theory part covers the basics of electromagnetic induction.

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  • Yes, under certain circumstances the electromagnetic interference from a mobile phone can affect the performance of some medical devices.

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  • Urea is the main form in which nitrogen is excreted in mammals UV radiation invisible rays that are part of the electromagnetic spectrum.

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  • Sun's energy is produced by nuclear fusion, which gives off electromagnetic radiation.

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  • Electromagnetic waves consist of oscillating electric and magnetic fields which induce oscillations of the dipole.

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  • panchromatic films except that they have extended red sensitivity to longer electromagnetic wavelengths.

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  • Thus, in his experiments, he measured electromagnetic fields around subjects performing allegedly paranormal feats.

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  • phosphorescence becquerel f. Of electromagnetic waves likely have been.

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  • propagaterates by propagating electromagnetic pulses into the ground or structure.

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  • In 1899, Fitzgerald asked him about electromagnetic wave propagation around a sphere, which Marconi's experiments showed to occur.

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  • Simply plug into a standard electrical socket to emit an ultrasonic sound and an electromagnetic pulse.

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  • X-ray - pictures of the bones taken using electromagnetic radiation.

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  • The enemy can use his vision across a broad band of the electromagnetic spectrum.

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  • Our century has seen the entire electromagnetic spectrum opened for business.

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  • Sources of Electromagnetic Interference (EMI ); power lines, transformer substations, transmitters, GSM base stations, mobile phones.

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  • trilobite molecule can be created by manipulating a rubidium BEC with laser pulses or external electromagnetic fields.

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  • SOHO allows us to view the Sun in the part of the electromagnetic spectrum known as the extreme ultraviolet.

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  • Sunlight consists of electromagnetic radiation of wavelengths from 20 microns at the far infrared end to 200 nanometres at the far ultraviolet end.

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  • To binge drink quot drawing its of electromagnetic waves.

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  • whirling electromagnetic dance that no human will ever speak.

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  • A discussion of these and other questions upon the basis of the electromagnetic theory of light is given in the Phil.

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  • These were actually made between 1885 and 1889, when he was professor of physics in the Carlsruhe Polytechnic. He himself recorded that their origin is to be sought in a prize problem proposed by the Berlin Academy of Sciences in 1879, having reference to the experimental establishment of some relation between electromagnetic forces and the dielectric polarization of insulators.

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  • It was of course well known, as a necessity of Maxwell's mathematical theory, that the polarization and depolarization of an insulator must give rise to the same electromagnetic effects in the neighbourhood as a voltaic current in a conductor.

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  • Continuing his inquiries for the next year or two, he was able to discover the progressive propagation of electromagnetic action through space, to measure the length and velocity of electromagnetic waves, and to show that in the transverse nature of their vibration and their susceptibility to reflection, refraction and polarization they are in complete correspondence with the waves of light and heat.

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  • If the current drive an electromagnetic engine, the reaction of the engine will produce an electromotive force opposing the current.

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  • We have seen that the efficiency of an electromagnetic engine is greatest when the current is indefinitely small, and then the rate at which it works is also indefinitely small.

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  • circuit-closing apparatus called a relay, which is practi cally an electromagnetic key which has its lever attached to the armature of the magnet and which can be worked by a very weak current.

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  • By the action of the two variable currents on the electromagnetic mechanism in the receiver, the two component motions are reproduced and by their combined action on a second system of levers the receiving pen is caused to duplicate the motions of the transmitting pencil.

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  • When there is no current the shutter covers the perforations and no light passes, but when a current traverses the wires they are depressed by electromagnetic action, carrying the shutter with them, and a quantity of light proportional to the current strength is admitted through the perforations.

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  • indicator, suitably supported, a to-and-fro motion was recorder given by the electromagnetic actions due to the electric currents constituting the signals.

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  • On the question of how far the effects are due to conduction between the earth plates, and how far to true electromagnetic induction, authorities differ, some being of opinion that the two effects are in operation together.

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  • Popoff employed an electromagnetic tapper, in fact the mechanism of an electric bell with the gong removed, for this purpose.

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  • Marconi, by giving great attention to details, improved the electromagnetic tapper, and, combining it with his improved form of sensitive tube, made a telegraphic instrument as follows: the small glass tube, containing nickel and silver filings between two silver plugs, was attached to a bone holder, and under this was arranged a small electromagnet having a vibrating armature like an electric bell carrying on it a stem and hammer.

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  • Dolbear, 2 the effects were produced by electrostatic instead of electromagnetic forces, as in con- the Bell telephone.

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  • The step to magnetic phenomena was comparatively simple; but it was otherwise as regards electromagnetic phenomena, where current electricity is essentially involved.

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  • Availing himself of the admirable generalized co-ordinate system of Lagrange, Maxwell showed how to reduce all electric and magnetic phenomena to stresses and motions of a material medium, and, as one preliminary, but excessively severe, test of the truth of his theory, he pointed out that (if the electromagnetic medium be that which is required for the explanation of the phenomena of light) the velocity of light in vacuo should xvii.

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  • 30 be numerically the same as the ratio of the electromagnetic and electrostatic units.

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  • (See Electrokinetics.) The whole field thus opened up he explored with characteristic industry and care, and developed a mathematical theory which not only explained the electromagnetic phenomena already observed but also predicted many new ones.

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  • Between 1882 and 1889 a series of papers on certain points in the electromagnetic theory of light and its relation to the various elastic solid theories appeared in the American Journal of Science, and his last work, Elementary Principles in Statistical Mechanics, was issued in 1902.

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  • Hence we may classify ammeters into (1) Thermal; (2) Electromagnetic, and (3) Electrodynamic instruments.

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  • Electromagnetic Ammeters.

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  • In its simplest form an electromagnetic ammeter consists of a circular coil of wire in which is pivoted eccentrically an index needle carrying at its lower end a small mass of iron.

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  • A much better form of electromagnetic ammeter can be constructed on a principle now extensively employed, which consists in pivoting in the strong field of a permanent magnet a small coil through which a part of the current to be measured is sent.

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  • In these the indicating needle moves over a graduated cylindrically shaped scale, and they are for the most part electromagnetic instruments (see fig.

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  • According to the electromagnetic theory of light K = N2, where N is the refractive index for rays of infinite wave-length.

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  • In 1847 Morse was compelled to defend his invention in the courts, and successfully vindicated his claim to be called the original inventor of the electromagnetic recording telegraph.

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  • electromagnetic unit of current, this number becomes I 036 X 4.

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  • electromagnetic system of units will be generally adopted, and, unless otherwise stated, magnetic substances will be assumed to be isotropic, or to have the same physical properties in all directions.

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  • Grassot has devised a galvanometer, or " fluxmeter," which greatly alleviates the tedious operation of taking ballistic readings.2 The instrument is of the d'Arsonval type; its coil turns in a strong uniform field, and is suspended in such a manner that torsion is practically negligible, the swings of the coil being limited by damping influences, chiefly electromagnetic. The index therefore remains almost stationary at the limit of its deflection, and the deflection is approximately the same whether the change of induction occurs suddenly or gradually.

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  • It is, of course, true for permanent magnets, where H = o, since then F = 27rI 2; but if the magnetization is due to electric currents, the formula is only applicable in the special case when the mutual action of the two magnets upon one another is supplemented by the electromagnetic attraction between separate magnetizing coils rigidly attached to them.2 The traction method was first employed by S.

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  • In order to meet the objection that the phenomenon might be due to electromagnetic action between the coil and the rod, Bidwell made some experiments with iron rings, and found that the length of their diameters varied under magnetization in precisely the same manner as the length of a straight rod.

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  • In particular, he found that the calculated velocity with which it transmitted electromagnetic disturbances was equal to the observed velocity of light; hence he was led to believe, not only that his medium and the ether were one and the same, but, further, that light itself was an electromagnetic phenomenon.

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  • On the electromagnetic theory, the problem of diffraction becomes definite when the properties of the obstacle are laid down.

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  • "Antenna, device, destine to receiving or transmitting electromagnetic waves.

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  • Function of receive antenna is extraction energy from electromagnetic field.

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  • Transmit antenna convert energy of generator into radiation of electromagnetic waves.

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  • At the age of nineteen he invented an electromagnetic engine, and in the course of examining its performance dissatisfaction with vague and arbitrary methods of specifying elec rical quantities caused him to adopt a convenient and scie tific unit, which he took to be the amount of electricity req ired to decompose nine grains of water in one hour.

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  • The evidence for the existence of the luminiferous aether has accumulated as additional phenomena of light and other radiations have been discovered; and the properties of this medium, as deduced from the phenomena of light, have been found to be precisely those required to explain electromagnetic phenomena."

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  • Poisson; the flow of electromagnetic waves along wires (Sir J.

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  • P. Drude has obtained a similar formula based on the electromagnetic theory, thus placing the theory of dispersion on a much more satisfactory basis.

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  • Electromagnetic voltmeters may therefore be thermal, electromagnetic or electrodynamic. As a rule, electromagnetic voltmeters are only suitable for the measurement of relatively small potentials - o to 200 or 300 volts.

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  • Electromagnetic voltmeters consist of a coil of fine wire connected to the terminals of the instrument, and the current produced in that wire by a difference of potential between the terminals creates a magnetic field proportional at any point to the strength of the current.

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  • One of the most useful forms of electromagnetic voltmeter is that generally known as a movable coil voltmeter (fig.

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  • In this case a highresistance wire is connected between the points of which the potential difference is required, and from some known fraction of this resistance wires are brought to an electrostatic voltmeter, or to a movable coil electromagnetic voltmeter, according as the voltage to be measured is alternating or continuous.

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  • The "dielectric constant" of a medium is its specific inductive capacity, and on the electromagnetic theory of light it equals the square of its refractive index for light of infinite wave length (see Electrostatics; Magneto-Optics).

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  • It was an electrostatic and electromagnetic machine combined, driven by an electric current and producing in turn electrostatic charges of electricity.

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  • The Galitzin seismograph, devised by Prince Galitzin, is of the same type, but it essentially differs from the Milne instrument in having its pendulum dead-beat; this is brought about by an electromagnetic device.

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  • In 1849 he contributed to the Comptes Rendus a description of an electromagnetic regulator for the electric arc lamp, and, in conjunction with H.

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  • The third covers the period between 1831 and Clerk Maxwell's enunciation of the electromagnetic theory of light in 1865 and the invention of the self-exciting dynamo, which marks another great epoch in the development of the subject; and the fourth comprises the modern development of electric theory and of absolute quantitative measurements, and above all, of the applications of this knowledge in electrical engineering.

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  • In 1821 Michael Faraday (1791-1867), who was destined later on to do so much for the science of electricity, discovered electromagnetic rotation, having succeeded in causing a wire conveying a voltaic current to rotate continuously round the pole of a permanent magnet.

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  • Herschel, Peter Barlow and others, but did not receive a final explanation until after the discovery of electromagnetic induction by Faraday in 1831.

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  • In 1831 Faraday began the investigations on electromagnetic induction which proved more fertile in far-reaching practical consequences than any of those which even his genius gave to the world.

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  • This important fact laid the foundation for all subsequent inventions which finally led to the production of electromagnetic or dynamo-electric machines.

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  • He not only collected the facts concerning electromagnetic induction so industriously that nothing of importance remained for future discovery, and embraced them all in one law of exquisite simplicity, but he introduced his famous conception of lines of force which changed entirely the mode of regarding electrical phenomena.

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  • Neumann in 1845 did for electromagnetic induction what Ampere did for electrodynamics, basing his researches upon the experimental laws of Lenz.

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  • The phenomena of light had compelled physicists to postulate a space-filling medium, to which the name ether had been given, and Henry and Faraday had long previously suggested the idea of an electromagnetic medium.

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  • He formulated the conception, therefore, of electric charge as consisting in a displacement taking place in the dielectric or electromagnetic medium (see Electrostatics).

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  • for 1865, entitled " A Dynamical Theory of the Electromagnetic Field."

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  • Maxwell showed in this paper that the velocity of propagation of an electromagnetic impulse through space could also be determined by certain experimental methods which consisted in measuring the same electric quantity, capacity, resistance or potential in two ways.

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  • The two systems of measurement were called respectively the electrostatic and the electromagnetic systems (see Physical Units).

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  • Maxwell suggested new methods for the determination of this ratio of the electrostatic to the electromagnetic units, and by experiments of great ingenuity was able to show that this ratio, which is also that of the velocity of the propagation of an electromagnetic impulse through space, is identical with that of light.

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  • Experimental methods were devised for the further exact measurements of the electromagnetic velocity and numerous determinations of the dielectric constants of various solids, liquids and gases, and comparisons of these with the corresponding optical refractive indices were conducted.

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  • The accumulating determinations of the numerical value of the electromagnetic velocity (v) from the earliest made by Lord Kelvin (Sir W.

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  • After he had educated himself by the study of the phenomena of lines of magnetic force in his discoveries on electromagnetic induction, he applied the same conception to electrostatic phenomena, and thus created the notion of lines of electrostatic force and of the important function of the dielectric or non-conductor in sustaining them.

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  • Since Faraday was well aware that even a good vacuum can act as a dielectric, he recognized that the state he called dielectric polarization could not be wholly dependent upon the presence of gravitative matter, but that there must be an electromagnetic medium of a supermaterial nature.

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  • 3 X 10 24 gramme and that the unit atomic charge or natural unit of electricity is 1.3 X 1020 of an electromagnetic C.G.S.

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  • 3 X Io 2 ° of an electromagnetic unit, and the ratio of its charge to its mass is nearly 2 X 10 7 using E.M.

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  • Trans., 1894, 185; 1895, 186; 1897, 190), and subsequently in his book Aether and Matter (1900), a remarkable hypothesis of the structure of the electron or corpuscle, which he regards as simply a strain centre in the aether or electromagnetic medium, a chemical atom being a collection of positive and negative electrons or strain centres in stable orbital motion round their common centre of mass (see Aether).

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  • Thomson also developed this hypothesis in a profoundly interesting manner, and we may therefore summarize very briefly the views held on the nature of electricity and matter at the beginning of the 10th century by saying that the term electricity had come to be regarded, in part at least, as a collective name for electrons, which in turn must be considered as constituents of the chemical atom, furthermore as centres of certain lines of self-locked and permanent strain existing in the universal aether or electromagnetic medium.

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  • Atoms of matter are composed of congeries of electrons and the inertia of matter is probably therefore only the inertia of the electromagnetic medium.'

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  • Heaviside, Electromagnetic Theory (London, 1893); O.

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  • He studied the phenomena of electrical oscillations from 1869 to 1871, and in the latter year he announced that the velocity of the propagation of electromagnetic induction was about 314,000 metres per second.

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  • Fitzgerald was the first to attempt to measure the length of electric waves; Helmholtz put the problem into the hands of his favourite pupil, Heinrich Hertz, and the latter finally gave an experimental demonstration of electromagnetic waves, the "Hertzian waves," on which wireless telegraphy depends, and the velocity of which is the same as that of light.

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  • Two other courses of lectures were published in volume form, Dynamo-Electric Machinery (1882), and The Electro-magnet and Electromagnetic Mechanism (1891).

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  • About the same time he devised and constructed the first electromagnetic engine with automatic polechanger (Sill.

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  • Arago had previously done on a smaller scale), where he made magnetic observations, and from this same observatory he sent telegraphic signals to the neighbouring town, thus showing the practicability of an electromagnetic telegraph.

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  • Similarly on the electromagnetic theory the electric or the magnetic force will be perpendicular to the plane of polarization, according as chemical action depends upon the electric or the magnetic energy.

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  • He also carried on extensive researches in the theory of magnetism; and it is interesting that in connexion with his observations in terrestrial magnetism he not only employed an early form of mirror galvanometer, but also, about 1833, devised a system of electromagnetic telegraphy, by which a distance of some 9000 ft.

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  • Simply plug into a standard electrical socket to emit an ultrasonic sound and an electromagnetic pulse.

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  • X-ray - pictures of the bones taken using electromagnetic radiation.

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  • Electromagnetic forces grip atoms to one another building up molecules and the solidity of matter.

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  • The enemy can use his vision across a broad band of the electromagnetic spectrum.

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  • Sources of Electromagnetic Interference (EMI); power lines, transformer substations, transmitters, GSM base stations, mobile phones.

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  • The researchers believe the trilobite molecule can be created by manipulating a rubidium BEC with laser pulses or external electromagnetic fields.

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  • Sunlight consists of electromagnetic radiation of wavelengths from 20 microns at the far infrared end to 200 nanometres at the far ultraviolet end.

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  • The real language of computers is a whirling electromagnetic dance that no human will ever speak.

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  • Poor quality monitors may not even survive your cordless phone let alone the massive electromagnetic fields emanating from your computer set up.

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  • These type of guns use electromagnetic polarization that shoves the nail from the solenoid into the wood.

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  • Electromagnetic thermostats are excellent for first-timers.

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  • The electromagnetic thermostats work with most types of heating and cooling systems.

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  • Because they are a hybrid of the electromagnetic and digital thermostats, they work with almost all types of systems.

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  • There are concerns that the turbines can cause electromagnetic interference.

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  • The use of direct solar power requires only one step, called electromagnetic radiation, in order to convert solar energy into useable power.

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  • A generator is the device that collects the wind energy from the shaft and uses electromagnetic induction to produce voltage; a usable type of power.

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  • In the early 1960s, Kirsch introduced a professional line of traverse tracks, and in 1967, the company came up with the first motorized electromagnetic traverse rod.

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  • Electromagnetic pulses cause the tube and needle bar to rapidly contract up and down.

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  • This new heating device uses electromagnetic radiation to heat the human body from the inside out, similar to how warmth is received from the sun.

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  • To understand what infrared is, you must first understand the electromagnetic spectrum, much of which is not visible to the unaided human eye.

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  • The electromagnetic spectrum includes (from longest wavelength to shortest) radio waves, microwaves, infrared, red, orange, yellow, green, blue, indigo, violet, ultraviolet, x-rays, and gamma rays.

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  • The human eye can see only those wavelengths from red to violet; this portion of the electromagnetic spectrum is called "visible light."

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  • Of all of the colors on the electromagnetic spectrum, ultraviolet light (UV) has the worst reputation.

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  • Light energy in all areas of the electromagnetic spectrum, from radio wave through gamma rays, is generated by the sun.

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  • Superman the Escape: Located at Six Flags Magic Mountain in California, this LSM electromagnetic launch coaster was built in 1997 and was the first to reach 100 miles per hour.

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  • X rays are electromagnetic radiation that differentially penetrates structures within the body and creates images of these structures on photographic film or a fluorescent screen.

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  • Electromagnetic radiation-Packets of energy that develop when an electric current passes through a vacuum tube.

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  • Remove the Television and Other Electronic Devices: All electronic devices produce electromagnetic fields.

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  • This part consists of a system that controls the power output, a timer that may be electronic or electromagnetic, interlock devices, and protection devices.

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  • Technically, infrared is part of what's known as the electromagnetic light spectrum.

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  • MT: Induction cooking is an advanced cooking technology that uses electromagnetic energy to generate instant heat to the cookware.

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  • Some examples of paranormal activity include apparitions, voices captured on electromagnetic voice phenomena (EVP) equipment, objects moving, sounds, temperature fluctuations and personal experiences.

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  • Later, the world of electronics allowed the conversion of sound waves from a microphone into "electromagnetic fluctuation" that gets imprinted into magnetic tape or, in the case of today's digital recorders, a digital memory chip.

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  • Other researchers are working on finding ways to help entities manipulate electromagnetic frequency (EMF) with a speech chip that converts the spirit-modulated EMF into words or allophones.

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  • The bar is operated by electromagnetic coils that move the needle up and down in rapid, yet precise movements.

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  • Its electromagnetic radiation is the cause of the common condition everyone knows and loves: sunburn.

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