The centripetal force is, however, the exact counterpart and complement of the centrifugal force, in the same way that the latter is the exact counterpart of the former, as we have already learned that the centrifugal force operates along the same path, and that it is subject to the same law of proportion, being equal to the product of the masses of a body ([Art. 85]), and further, that its intensity is inversely as the square of the distance ([Arts. 66], [74] and [84]).
We have, however, discovered that the physical cause of the centrifugal force is due to the pressure of the electro-magnetic Aether ([Art. 96]). If, therefore, the physical cause of that law which is the complement and counterpart of Gravitation Attraction is to be found, and alone found, in the pressure and motions of the electro-magnetic Aether, then it is only logical and reasonable to infer that the physical cause of the Attraction of Gravitation is to be found in the same electro-magnetic Aether. That the Attraction of Gravitation is to be found in this medium is now an accepted hypothesis among scientists. Because, unless the physical cause of Gravitation Attraction is to be found in this electro-magnetic Aether, then, in order to account for that attraction, we should have to postulate the existence of another medium in space, in lieu of the Aether, which would be to the centripetal force what the Aether is to the centrifugal force. This would be distinctly unphilosophical, as it would be a violation of the first two rules of our philosophy, in that it would not be simple in its conception, and that such a hypothesis would imply the existence of two media which would occupy the same planetary and interstellar space at one and the same time, and this is a violation of all experience in its widest form.
Therefore the physical cause of Gravitation must be sought for in the same medium which gives the physical cause of the companion force, and that medium is the electro-magnetic Aether. Professor Preston in his Theory of Light is of this opinion. In Art. 327 he writes: “To account for the propagation of heat and light, that is, of radiant energy, we have postulated the existence of a medium filling all space. But the transference of the energy of radiant heat and light is not the only evidence we have in favour of the existence of an Aether. Electric, magnetic and electro-magnetic phenomena and Gravitation itself point in the same direction.”
Professor Lodge, in his Modern Views of Electricity, is even more explicit in his statement of the case. On page 338 he states: “Gravitation is explainable by differences of pressure in the medium (i. e. the Aether) caused by some action between it and matter not yet understood.” Further, Newton himself suggested that the physical cause of Gravitation Attraction was to be found in that aetherial medium which pervaded all space.
If, therefore, we attempt to explain the physical cause of Gravitation Attraction by the tensions of the universal Aether, we shall not only be dealing with the subject from a philosophical standpoint, but we shall solve the problem in that direction in which Professors Preston and Lodge and other scientists have suggested we are to seek for the solution. Professor Curry, in his Theory of Electricity and Magnetism, page 406, states: “If we regard the luminiferous Aether, as defined by Von Helmholtz's equations, as the given medium or transmitter of so-called gravitating action, we are then able on the one hand to interpret its longitudinal oscillations as gravitational waves propagated through space with the given enormous velocity, and on the other hand, to form some conception of the mysterious force of Gravitation itself, for we can then conceive it as a medium stress arising from a certain type of Aether oscillations, its longitudinal ones, that pervade entire space.”
Now in order for us to lead up to the physical cause of the centripetal force, we must recall some of the facts already given with regard to planetary and solar space. Thus we have learned that the sun is an electro-magnet possessing its own magnetic field, with its lines of force ([Art. 88]). We have also learned that all the planets are electro-magnets, each possessing its own field with its lines of force ([Art. 91]).
We have further seen that the cause of all this electro-magnetism is due to the fact that electric currents are continually circulating round each body, and by their conjoint action with the magnets there are produced the electro-magnetic fields that are associated with each body in the solar system. From this hypothesis we arrived at the conclusion, that wherever there was Aether, there we found electricity, because of the electro-magnetic basis which Aether possesses. This result is fully confirmed by Maxwell's electro-magnetic theory of light ([Art. 78]), which has been so fully experimentally demonstrated by Hertz. Indeed, in the minds of several scientists there is a growing conviction that Aether and Electricity are possibly one and the same substance.
Professor Lodge, in the work already referred to, in relation to this hypothesis, writes in the preface to that book: “Crudely, one may say that as heat is a form of energy, so electricity is a form of Aether, or a mode of aetherial manifestation.” And again: “A rough and crude statement adapted for popular use is that Electricity and Aether are identical. But that is not all that has to be said, for there are two opposite kinds of electricities, and there are not two Aethers. But there may be two aspects of one Aether, just as there are two sides to a sheet of paper.”
As, therefore, we learn that Aether has an electro-magnetic basis, and that electricity is a mode of aetherial manifestation, we have therefore to consider one of the most fundamental laws of electricity, and note its application to solar and planetary space.
It is one of the fundamental laws of electricity, that equal and opposite quantities of electricity are always generated at one and the same time. Faraday's well-known ice-pail experiment proved this. It is an absolute impossibility for one kind of electricity to be generated without an equal quantity of the opposite kind being produced, although it is not strictly correct to use the term generated or produced in relation to electricity, as electricity cannot really be produced by any process whatever.