Page:Aether and Matter, 1900.djvu/28

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CONTENTS
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SECTION V
Chapter XIV On the mechanism of molecular radiation 221
The aethereal disturbance propagated from a moving electron. The field of a vibrating doublet; of an electron describing an orbit. The type of radiation emitted from a moving electron: its intensity: a uniformly moving electron does not radiate. Isolated pulse caused by sudden disturbance: its energy conserved as it moves onward: mode of establishment of a steady magnetic field as the trail of such a pulse. Conditions for absence of radiation from a molecule: concentration of its energy
Chapter XV On the nature of ordinary radiation, and its synthesis into regular wave-trains 235
Röntgen radiation, not of vibratory origin: its intensity per molecule: absorption proportional to density. The Fourier analysis, how far objective. Analysis of radiation by a series of simple damped receivers: response to a discontinuous pulse, to a damped wave-train: case of Hertzian radiation. Character of radiation from gases: periods, effective phase, interference. Periodicity created or intensified by the analyzer; case of a grating; case of a prism. Röntgen radiation would analyze into high periods.
Appendix A On the principles of the theory of magnetic and electric polarity: and on the mechanical significance of divergent integrals 252
Definition of polarity: its relation to the Maxwellian electric displacement: polarization of dielectric matter. Distribution of polarity replaced by a distribution of density. Formal laws of induced polarization. Transition from the aggregate of molecular polar elements to the polarized mechanical medium. The potential of mechanical theory defined: the actual magnetic vector potential must be modified to a mechanical form. The integrals occurring in mechanical theory are defined by their principal values. The formula for electric force always consists of an electrokinetic part added to the electrostatic force.
Appendix B On the scope of mechanical explanation: and on the idea of force 268
General mechanics based on principle of virtual work and principle of d'Alembert. Generalized law of mechanical reaction. Scope and physical reality of statics: idea of force fundamental and prior to mechanical motions. The method of molecular dynamics. Mechanics a growing science as regards its principles. General kinetics formulated
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