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![]() "Szczepan Bialek" wrote in message ... "Art Unwin" wrote ... On Jun 1, 2:39 am, Szczepan Białek wrote: "1861 - Maxwell publishes a mechanical model of the electromagnetic field. Magnetic fields correspond to rotating vortices with idle wheels between them and electric fields correspond to elastic displacements, hence displacement currents. The equation for now becomes , where is the total current, conduction plus displacement, and is conserved: . This addition completes Maxwell's equations and it is now easy for him to derive the wave equation exactly as done in our textbooks on electromagnetism and to note that the speed of wave propagation was close to the measured speed of light. Maxwell writes, ``We can scarcely avoid the inference that light in the transverse undulations of the same medium which is the cause of electric and magnetic phenomena.'' Thomson, on the other hand, says of the displacement current, ``(it is a) curious and ingenious, but not wholly tenable hypothesis.'' "1864 - Maxwell reads a memoir before the Royal Society in which the mechanical model is stripped away and just the equations remain. He also discusses the vector and scalar potentials, using the Coulomb gauge. He attributes physical significance to both of these potentials. He wants to present the predictions of his theory on the subjects of reflection and refraction, but the requirements of his mechanical model keep him from finding the correct boundary conditions, so he never does this calculation." From:http://maxwell.byu.edu/~spencerr/phys442/node4.html Try understand: "the mechanical model is stripped away and just the equations remain." Now engineers are using model with compressible, massive electrons. The equations are used by teacher to teach the math. According to Maxwell model the radio waves are transversal. Are such in your radio reality? S* Hi S, Interesting to read what you say as there are many similarities to my antenna work. Yes. But I do not try to work out a new theory. For me the 200 years old "acoustic analogy" is enough. A small addition with respect to light formation. Displacement current Displacement current is necessary in the model with electricity in form of the incompressible fluid. Incompressible fluid is a history. is the action required of three dimensional equilibrium which is why I often point to the helicopter as an example, same thing goes for a gyroscope or the Sedgway scooter. It is this circular motion that holds to the understanding of light since this provides the spin of a particle such that it has straight line trajectory. Straight line trajectory is normal phnomenon at the high frequences. The ultrasonic waves are like radii (see sonar) The frequency of circular motion is what changes when the particle enters a medium that is resistive where the spin increases to maintain the straight line projection. The energy for this increase in spin is the latent energy that is removed from the particles potential energy similar to latent heat with liquids. Thus energy is conserved by the increase in spin which is analogous to change in frequency! This change in frequency brings the particle into the area of color , light and X rays ie higher frequencies and the latent energy shows up as light until there is no more energy left and the particle has vaporized such that light progresses to invisiblity. This being similar to the effects shown of a meteorite as it comes into contact with the resistive environment of Earth. Each new theory is very difficult for me. I prefer descriptions of experiments and observations. With respect to radiation from the ends of a radiator. This can only happen when the radiator is a fraction of a wavelength when the law of equilibrium is violated. The accellaration of charge at the end is without spin applied and tho there is radiation it becomes non directional and unable to overcome the gravitational force and falls within a short distance. Try the acoustic analogy. Here the all is easy. Quite opposite as in the Maxwell model: "He wants to present the predictions of his theory on the subjects of reflection and refraction, but the requirements of his mechanical model keep him from finding the correct boundary conditions, so he never does this calculation". The only reason for Maxwell model is the light polarisation. In his era the polarisation was explained with transverse waves. Now we know (from Clark) that the apparatus is polarised not waves. Regards, S* i knew getting you and art together would be interesting... good for a whole evening full of laughs! the waves must be polarized to interact as observed with polarized antennas. |
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