Présentation de l'éditeur
Elenuit Ua of Electro-D ynunilc Miuihliie.ry, These experimental evidences point to tlie action of magnetic stress pervading the magnetized medium. Moreover the stress never terminates at an intersecting boundary, but follows closed paths. A line of stress is a closed loop like an endless chain. If a small compass-needle were introduced into a magnetic field, and kept advancing from point to point in the direction it assumed at each instaiii, it would finally return to the position from which it started. This can only be shown in the case of fields Cbtablished by electric currents in wires, or coils of wire, as the needle could not complete its circuit through the mas of an iron magnet. The circuital distribution of the stress indicates its appurtenance to the category of fluxes. That is to say, in any magnet, or magnetized region, there is a distribution of influence analogous to the flow of current in an electric circuit, or the flow of water in a closed pipe or re-entering channel. The marked distinction, however, betv-een the flow of magnetism, and the flow of electricity or of fluid material, lies in the fact that no work is done and no energy exchanged in the passage of the magnetic current. The electric current and the moving liquid encounter resistance and develop heat in moving against that resistance, but the magnetic flux acts as electrical currents or material currents might act, if unchecked by resistance but regulated in quantity by other limitations; and if water were itself frictionless, and were set circulating in a closed frictionless pipe, it would necessarily continue in perpetual motion. It of course by no means follows that any circulating motion of matter, or of ether, actually takes place in a magnetic circuit. That there is a possibility of such motion is a consideration left to the theory of the ultimate and fundamental nature and o
(Typographical errors above are due to OCR software and don't occur in the book.)
Présentation de l'éditeur
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