James Clerk Maxwell and Modern PhysicsMacmillan, 1896 - Broj stranica: 224 |
Ostala izdanja - Prikaži sve
Uobičajeni izrazi i fraze
action Ampère's laws atoms attraction bodies Cambridge Cavendish Laboratory centre of gravity circuit Clerk Maxwell College colours conductor connected curve dielectric direction discs distance Edinburgh elastic electric current electric displacement electric force electric waves Electricity and Magnetism equal equations ether experimental experiments Faraday Faraday's flow fluid gases given Glenlair Helmholtz Hence Hertz hypothesis idle wheels inductive capacity J. C. Maxwell James Clerk Maxwell kinetic energy laws lectures light lines of force Lord Kelvin magnetic field magnetic force magnetic induction mathematical Maxwell's theory mean free path measured mechanical medium method molecular momentum motion nature number of molecules observed obtained optics P. G. Tait paper particles phenomena physical polarisation pressure Professor Campbell propagation proportional quantities refractive rotation Royal Society scientific specific heat spectrum supposed surface temperature theory of electricity Thomson tion Tripos tubes vector potential velocity vibrations viscosity wire writes
Popularni odlomci
Stranica 81 - Science is incompetent to reason upon the creation of matter itself out of nothing. We have reached the utmost limit of our thinking faculties when we have admitted that because matter cannot be eternal and self-existent it must have been created.
Stranica 162 - Faraday, in his mind's eye, saw lines of force traversing all space where the mathematicians saw centers of force attracting at a distance. Faraday saw a medium where they saw nothing but distance. Faraday sought the seat of the phenomena in real actions going on in the medium; they were satisfied that they had found it in a power of action at a distance impressed on electric fluids.
Stranica 81 - On the other hand, the exact equality of each molecule to all others of the same kind gives it, as Sir John Herschel has well said, the essential character of a manufactured article, and precludes the idea of its being eternal and self-existent.
Stranica 203 - ... the other ? In fact, whenever energy is transmitted from one body to another in time, there must be a medium or substance in which the energy exists after it leaves one body and before it reaches the other, for energy, as Torricelli * remarked, ' is a quintessence of so subtile a nature that it cannot be contained in any vessel except the inmost substance of material things.
Stranica 153 - By referring everything to the purely geometrical idea of the motion of an imaginary fluid, I hope to attain generality and precision, and to avoid the dangers arising from a premature theory professing to explain the cause of the phenomena. If the results of mere speculation which I have collected are found to be of any use to experimental philosophers, in arranging and interpreting their results, they will have served their purpose, and a mature theory, in which physical facts will be physically...
Stranica 81 - None of the processes of nature, since the time when nature began, have produced the slightest difference in the properties of any molecule. We are therefore unable to ascribe either the existence of the molecules or the identity of their properties to the operation of any of the causes which we .call natural.
Stranica 178 - In speaking of the energy of the field, however, I wish to be understood literally. All energy is the same as mechanical energy, whether it exists in the form of motion or in that of elasticity, or in any other form.
Stranica 203 - But in all of these theories the question naturally occurs : — If something is transmitted from one particle to another at a distance, what is its condition after it has left the one particle and before it has reached the other...
Stranica 81 - That matter, as such, should have certain fundamental properties — that it should exist in space and be capable of motion, that its motion should be persistent, and so on, are truths which may, for anything we know, be of the kind which metaphysicians call necessary. We may use our knowledge of such truths for purposes of deduction ; but we have no data for speculating as to their origin.
Stranica 39 - Happy is the man who can recognize in the work of to-day a connected portion of the work of life, and an embodiment of the work of eternity. The foundations of his confidence are unchangeable, for he has been made a partaker of Infinity.