Researches on Diamagnetism and Magne-crystallic Action: Including the Question of Diamagnetic PolarityAppleton, 1888 - 288 páginas |
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antimony attraction axes axial position ball bar of bismuth beam Becquerel bismuth bar carbonate of iron carbonate of lime cocoon silk coil cores crystal crystalline cube cylinders deflection deportment diagonal diamag diamagnetic bar diamagnetic bodies diamagnetic force diamagnetic polarity diameter distance electro-magnet equatorial position exciting the magnet exhibited experiments Faraday fibre flat poles force acting former glass helices helix horizontal Iceland spar influence joining the poles latter line of compression magne-crystallic axis magnet was excited magnetic bodies magnetic field magnetic force magnetic pole magnetisation mass memoir ment molecular currents needle netic north pole opposite optic axis parallel Paramagnetic Bar particles perpendicular phenomena Phil plate Plücker Poggendorff's Annalen pole to pole principal cleavage prism repelled repulsion rhombus set axial set equatorial set its length shown in fig soft iron south pole sphere substance suspended tion torsion torsion balance torsion-balance tourmaline Weber wire
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Página 199 - ... indicate that the differences between these modes of action and that of a real polarity, whether magnetic or diamagnetic, might serve as a foundation on which to base a mode of investigation, and also to construct an apparatus that might give useful conclusions and results in respect of this inquiry. For, if the polarity exists it must be in the particles and for the time permanent, and therefore distinguishable from the momentary polarity of the mass due to induced temporary currents ; and it...
Página 27 - Tyndall accordingly concludes that " if the arrangement of the component particles of any body be such as to present different degrees of proximity in different directions, then the line of closest proximity, other circumstances being equal, will be that chosen by the respective forces for the exhibition of their greatest energy. If the mass be [parajmagnetic, this line will stand axial; if diamagnetic, equatorial."2 1 Tyndall on Diamagnetism, p.
Página 81 - influence, leurs formes n'influeront plus sur les resultats qui " dependront seulement de la somme de leurs volumes, comparee " au volume entier de ce corps,* et qui seront alors les memes en " tout sens. Ce dernier cas est celui du fer forge, et sans doute " aussi des autres corps non cristallises dans lesquels on a " observe le magnetisme : mais il serait curieux de chercher si " le premier cas n'aurait pas lieu lorsque ces substances sont " cristalisees ; on pourrait s'en assurer par 1'experience,...
Página 112 - It was also proved that the force which determined the position of the optic axes in the magnetic field was not independent of the magnetism or diamagnetism of the mass of the crystal ; inasmuch as two crystals, of the same form and structure, exhibited altogether different effects, when one of them was magnetic and the other diamagnetic.
Página 89 - A piece of iron in place of the bismuth produces the contrary deflection of the needle. 2690. I have repeated this experiment most anxiously and carefully, but have never obtained the slightest trace of action with the bismuth. I have obtained action with the iron ; but in those cases the action was far less than if the iron were applied outside between the horseshoe magnet and the needle, or to the needle alone, the magnets being entirely away. On using a garnet, or a weak magnetic substance of...
Página 45 - Faraday established the existence of the force called diamagnetism, and from that time to the present some of the first minds in Germany, France and England have been devoted to the investigation of this subject. One of the most important aspects of the inquiry is the relation which subsists between magnetism and diamagnetism. Are the laws which govern both forces identical ? Will the mathematical expression of the attraction in the one case be converted into the expression of the repulsion in the...
Página 67 - If the arrangement of the component particles of any body be such as to present different degrees of proximity in different directions, then the line of closest proximity (other circumstances being equal) will be that of strongest attraction in magnetic bodies, and of strongest repulsion in diamagnetic bodies.
Página 172 - ... were so constructed that the line of pressure was parallel to the length of each. The rectangular box before referred to was suspended from its centre of gravity O in the magnetic field, so that the two prisms were in the same horizontal plane. Let the position of the box thus suspended horizontally be that shown in fig. 2. For the sake of simplicity, we will confine our attention to the action of one of the poles N, which may be either flat or rounded, upon the prism hf adjacent to it, as indeed...
Página 25 - But though it thus takes up the character of a force acting at a distance, still it is due to that power of the particles which makes them cohere in regular order and gives the mass its crystalline aggregation, which we call at other times the attraction of aggregation, and so often speak of as acting at insensible distances.
Página 220 - A corresponding experiment was made, hanging the crystal as a pendulum by a bifilar suspension of cocoon silk 30 feet in length, with the same result. 2554. Another very striking series of proofs that the effect is not due to attraction or repulsion, was obtained in the following manner. A skein of fifteen filaments of cocoon silk, about 14 inches long, was made fast above, and then a weight of an ounce or more hung to the lower end ; the middle of this skein was about the middle of the magnetic...