The Contributions of H.F.E. Lenz to ElectromagnetismAcorn Press, 1923 - 155 páginas |
Otras ediciones - Ver todo
Términos y frases comunes
Acad Academy Annal apparatus application armature Band battery Bemerkungen bibliography biographical Bull CHAPTER circuit coil conception connected considered contributions copper wire current is induced deflected direction discovery effect elec electrical currents electrical resistance electricity from magnetism electrodynamic electromag electromagnetic induction electromotive force electromotive power electromotive spirals Elektricität established experiments of Faraday facts Faraday and Henry Faraday's Franklin Institute Franz Neumann galvanic galvanischen galvanometer Gesetze grasped HEINRICH Friedrich Emil helix historical ical important induced conductor induced current influence interest internal resistance investigations iron iron helix James Clerk Maxwell labors Lenz's Law lines of force magnetic curves magnetic field magnitude mathematical Mém memoir ment metals methods needle Neumann north pole Ohm's Ohm's law original paper Pétersb Petersburg phenomena philosophical physics placed Poggend Poggendorff's Annalen practical principles reader relation SCIENCE OF ELECTROMAGNETISM scientific scientist significance statement Ströme tests theory tion tricity voltaic wheel wound
Pasajes populares
Página 40 - Before having any knowledge of the method given in the above account, I had succeeded in producing electrical effects in the following manner, which differs from that employed by Mr. Faraday, and which appears to me to develop some new and interesting facts. A piece of copper wire, about thirty feet long and covered with elastic varnish, was closely coiled around the middle of the soft iron armature of the galvanic magnet described in Vol.
Página 51 - These considerations, with their consequence, the hope of obtaining electricity from ordinary magnetism, have stimulated me at various times to investigate experimentally the inductive effect of electric currents.
Página 56 - One of these helices was connected with a galvanometer, and the other with a battery of one hundred pairs of plates four inches square, with double coppers, and well charged. When the contact was made, there was a sudden and very slight effect at the galvanometer, and there was also a similar slight effect when the contact with the battery was broken.
Página 41 - ... vessel of dilute acid, the galvanic battery attached to the magnet. At the instant of immersion the north end of the needle was deflected 30° to the west, indicating a current of electricity from the helix surrounding the armature. The effect however, appeared only as a single impulse, for the needle after a few oscillations resumed its former undisturbed position in the magnetic meridian, although the galvanic action of the battery, and consequently the magnetic power still continued.
Página 57 - A were connected end to end so as to form one common helix, the extremities of which were connected with a battery of ten pairs of plates four inches square. The galvanometer was immediately affected, and to a degree far beyond what has been described...
Página 57 - ... but though the contact was continued, the effect was not permanent, for the needle soon came to rest in its natural position, as if quite indifferent to the attached electro-magnetic arrangement. Upon breaking the contact with the battery, the needle was again powerfully deflected, but in the contrary direction to that induced in the first instance.
Página 39 - ... magnets possess other properties, which render them important instruments in the hands of the experimenter; their polarity can be instantaneously reversed, and their magnetism suddenly destroyed or called into full action, according as the occasion may require. With this view, I commenced, last August, the construction of a much larger galvanic magnet than, to my knowledge, had before been attempted, and also made preparations for a series of experiments with it on a large scale, in reference...
Página 39 - Besides their great power, these magnets possess other properties, which render them important instruments in the hands of the experimenter; their polarity can be instantaneously reversed, and their magnetism suddenly destroyed or called into full action, according as the occasion may require. With this view, I commenced, last August, the construction of a much larger galvanic magnet than, to my knowledge, had before been attempted, and also made preparations for a series of experiments with it on...
Página 53 - Experiments on induction by connecting wire of voltaic battery: — a battery of four troughs, ten pairs of plates, each arranged side by side — the poles connected by a wire about four feet long, parallel to which was another similar wire separated from it only by two thicknesses of paper, the ends of the latter were attached to a galvanometer: — exhibited no action, &c. &c. &c. — Could not in any way render any induction evident from the connecting wire.
Página 44 - Feb. 17. — Mr. Faraday gave an account of the first two parts of his researches in electricity; namely, Voltaelectric induction and magnetoelectric induction. If two wires, A and B, be placed side by side, but not in contact, and a Voltaic current be passed through A , there is instantly a current produced by induction in B, in the opposite direction. Although the principal current in A be continued, still the secondary current in B is not found to accompany it, for it ceases after the first moment...