The London, Edinburgh and Dublin Philosophical Magazine and Journal of Science

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Taylor & Francis, 1854
 

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Pagina 43 - An Essay on the application of Mathematical Analysis to the Theories of Electricity and Magnetism...
Pagina 48 - If the distance between the earth and the sun is 93 million miles, and if the mass of the sun is 300,000 times that of the earth, find two positions in which a particle would be equally attracted by the earth and the sun. The gravitational attraction of one body upon another varies inversely as the square of the distance and directly as the product of the masses. Represent the mass of the earth by unity.
Pagina 152 - ... solutions. The same substances are likewise always chemically active bodies, and possess affinities which enable them to act upon the material of the earthenware septum. Lime and alumina were accordingly always found in solution after osmose, and the corrosion of the septum appeared to be a necessary condition of the flow. Septa of other materials, such as pure carbonate of lime, gypsum, compressed charcoal, and tanned sole-leather, although not deficient in porosity, gave no osmose, apparently...
Pagina 407 - It was in the year 1843 that I read a paper ' On the Calorific Effects of Magneto-Electricity and the Mechanical Value of Heat ' to the chemical section of the British Association assembled at Cork.
Pagina 30 - ... prove the incorrectness of Professor Challis's Theorem I. ; since in an orbit described by a body acted on by a force tending to a fixed centre, and varying, as Professor Challis supposes, as some function of the distance, the expression for the radius-vector in terms of the time cannot possibly contain any terms dependent on the sun's longitude. I now come to consider the reasoning by which Professor Challis arrives at his theorems. All this reasoning is based on his equation +--+«*-* • •...
Pagina 155 - ... must therefore be confined to dead matter. But such apprehensions are, it is believed, groundless, or at all events premature. All parts of living structures are allowed to be in a state of incessant change, of decomposition and renewal. The decomposition occurring in a living membrane, while effecting osmotic propulsion, may possibly therefore be of a reparable kind. In other respects chemical osmose appears to be an agency particularly adapted to take part in the animal (Economy.
Pagina 217 - In the last edition of Professor Lehmann's Animal Chemistry, vol. ii. p. 363, a very decided opinion is expressed against the conclusion to which I arrived in consequence of some experiments published in the Philosophical Transactions for 1851. I considered it proved that ammonia was partly at least converted into nitrous acid in its passage through the body. In opposition to this Professor Lehmann states, — 1st. That the method which I employed must of necessity give a reaction resembling that...
Pagina 152 - Osmose is eminently the phenomenon of weak solutions. The same substances are likewise always chemically active bodies, and possess affinities which enable them to act upon the material of the earthenware septum. Lime and alumina were accordingly always found in solution after osmose, and the corrosion of the septum appeared to be a necessary condition of the flow. Septa of other...
Pagina 53 - It is thus that Faraday arrives at a knowledge of some of the most important of the general theorems, which, from their nature, seemed destined never to be perceived except as mathematical truths.
Pagina 151 - Dutrochet when filled with a saline solution and immersed in water,) the passage of the salt outward is entirely by diffusion, and that a thin membrane does not sensibly impede that molecular process. The movement is confined to -the liquid salt particles, and does not influence the water holding them in solution, which is entirely passive : it requires no further explanation. The flow of water inwards, on the other hand, affects sensible masses of fluid, and is the only one of the movements which...

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