Diamagnetic Force Research Articles

On the Structural Character of Rock, and of Mineral Deposits, as effected by Electricity

An idea has long prevailed that many of our rock formations and metalliferous veins bear evidence of the disposing power of electricity. The uniformity of conditions—repeated over widely spread areas—the recurrence of the same kind of phenomena, whenever similar sets of conditions present themselves, have indicated a set of constants in nature which it is important to examine. Our rock formations may be distinguished into three marked varieties: — Crystalline, such as granite, c Sedementary or Aggregative, as sandstones, c and Laminated, as slates. Those rocks which are commonly called the metamorphic rocks are quite excluded from the present consideration. Is there any evidence that a polar force of any kind has determined the conditions of the crystalline rocks without entering upon the question of magnetic and dia-magnetic forces so fully and beautifully developed by the delicate investigations of Faraday, Plucker, and Tyndale? I would briefly state an experiment or two of my own, which appear to me to indicate the line along which investigation should be pursued. Upon the poles of an electro-magnet, (which, when connected with the voltaic battery, exerted a lifting power of about 2 cwt.,) was placed a glass dish. Into this was poured a solution of the salt which was under examination; and it was allowed to crystallise by spontaneous evaporation, the magnet being maintained in full action. If we examine the order of the magnetic radiations, or, as Faraday calls them, lines of magnetic force, we shall find them producing curves. See Fig. ...

On some Phenomena of Dia-Magnetism, With Experiments

In the course of some experiments, in which I was desirous of exhibiting the principal phenomena of Dia-Magnetism, described by Dr. Faraday in the transactions of the Royal Society, I was at first surprised at obtaining different results from those published; many metals which, according to Dr. Faraday, had appeared to take an equatorial position between the poles of the magnet, assumed the axial position as magnetic bodies. I soon observed that the nature or direction of the action upon many metals varied with the intensity of the magnetic force, and I found that such effects were in accordance with the observations of Professor Plucker. On this he appears to have correctly founded the hypothesis, that the dia-magnetic force increases more rapidly than the magnetic in relation to the power of the exciting magnet. Not being aware how far Professor Plucker may have extended his researches to the phenomena of the magnetic and dia-magnetic forces developed in pure metals, I conceived that the inquiry, how far such forces might be co-existent in the same metal, might lead to interesting results. In pursuing such investigations other phenomena presented themselves to me; and as these in some respects depend upon the power of the magnet employed, I will describe the apparatus with which the experiments were conducted. My electro magnet is composed of a bar of soft iron 1½ inches in diameter, 11 lbs. in weight, and about 20 inches in length, bent into a horse shoe form. It is covered in ...

On some new relations of the diamagnetic force

On some new relations of the diamagnetic force