The Alternate Current Transformer in Theory and Practice, 1권"The Electrician" Printing and Publishing Company, limited, 1889 |
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action air space angle battery centimetres coefficient condenser conductor constant copper wire core current strength diameter dielectric direction discharge displacement eddy currents effect electric current electro-magnetic electrostatic energy equal equation experiments Faraday flow galvanometer helix Hence hysteresis impressed electromotive force increased induced current induction balance induction coil inductive circuit instant iron wire length Leyden jar line integral lines of force lines of induction lines of magnetic Lord Rayleigh magnetic field magnetic force magnetic induction magnetising magnitude maximum value metal metres millimetres motion mutual induction needle number of lines obtained ohmic resistance ordinate permeability phase phenomena plane plate position primary circuit primary current produced Prof quantity rate of change ratio represents secondary circuit secondary coil secondary current self-induction sparking distance suppose surface tion transformer tube unit vertical vibration waves zero
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3 페이지 - By trials with a trough each was insulated from the other. Will call this side of the ring A. On the other side, but separated by an interval, was wound wire in two pieces, together amounting to about sixty feet in length, the direction being as with the former coils. This side call B.
367 페이지 - The discharge, whatever may be its nature, is not correctly represented (employing for simplicity the theory of Franklin) by the single transfer of an imponderable fluid from one side of the jar to the other; the phenomena require us to admit the existence of a principal discharge in one direction, and then several reflex actions backward and forward, each more feeble than the preceding, until the equilibrium is obtained.
367 페이지 - ... single transfer of an imponderable fluid from one side of the jar to the other; the phenomena require us to admit the existence of a principal discharge in one direction, and then several reflex actions backward and forward, each more feeble than the preceding, until the equilibrium is obtained. All the facts are shown to be in accordance with this hypothesis, and a ready explanation is afforded by it of a number of phenomena which are to be found in the older works on electricity, but which...
10 페이지 - He never considers bodies as existing with nothing between them but their distance, and acting on one another according to some function of that distance. He conceives all space as a field of force, the lines of force being in general curved, and those due to any body extending from it on all sides, their directions being modified by the presence of other bodies.
vii 페이지 - ... alike of triumphant discovery and of suggestive failure, make them independent of any commentator. The scientific writings of Henry deserve hardly less careful study, for in them we have not only the lucid explanations of the discoverer, but the suggestions and ideas of a most profound and inventive mind, and which indicate that Henry had early touched levels of discovery only just recently becoming fully worked.
21 페이지 - His conclusion is that there exist lines of force within the magnet of the same nature as those without. What is more, they are exactly equal in amount to those without. They have a relation in direction to those without ; and in fact are continuations of them. . . ' Every line of force, therefore, at whatever distance it may be taken from the magnet, must be considered as a closed circuit, passing in some part of its course through the magnet, and having an equal amount of force in every part of...
432 페이지 - EMF, as the integral of the latter round the circle is zero. A, then, represents the total EMF of induction, which is measured by the rate of variation of the number of magnetic lines of force which pass through the circle. If the electro-magnetic field containing the circle is assumed to be uniform, A will therefore be proportional to the component of the magnetic induction perpendicular to the plane of the secondary. It will therefore vanish when the direction of the magnetic induction lies in...
420 페이지 - C C' was superposed upon the ordinary discharges. The electro-static action could be got rid of by joining the micrometer knobs by means of a damp thread. The conductivity of this thread was therefore sufficient to afford a passage to the comparatively slow alternations of the coil discharge, but was not sufficient to provide a passage for the immeasureably more rapid alternations of the oscillatory current. Considerable sparking took place at the micrometer when its distance from CB C' was 1 or...
423 페이지 - It will be seen that the maximum sparking distance was attained for a somewhat greater length of side, which is explained by the fact that in the latter experiments the self-induction only was increased by increase of length, while in the former series the capacity was increased as well. Varying the resistance of the micrometer circuit by using copper and German silver wires of various diameters was found to have no eft'ect on the period of oscillation, and extremely little on the sparking distance.
5 페이지 - ... feet long) ; then it was quickly thrust in the whole length, and the galvanometer needle moved ; then pulled out, and again the needle moved, but in the opposite direction. This effect was repeated every time the magnet was put in or out, and therefore a wave of electricity was so produced from mere approximation of a magnet, and not from its formation in situ.