A general and elementary view of the undulatory theory, as applied to the dispersion of light, and some other subjects

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Parker, 1841 - 131 pagina's
 

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Pagina xii - For to me the fundamental supposition itself seems impossible; namely that the waves or vibrations of any fluid can like the rays of light be propagated in straight lines, without a continual and very extravagant spreading and bending every way into the quiescent medium where they are terminated by it. I am mistaken if there be not both experiment and demonstration to the contrary.
Pagina xiii - Are not all hypotheses erroneous in which light is supposed to consist in pression or motion, propagated through a fluid medium?
Pagina x - In -the second place, it is to be supposed that the {ether is a vibrating medium like air, only the vibrations far more swift and minute ; those of air made by a man's ordinary "voice, succeeding one another at more than half a foot or a foot distance, but those of eether at a less distance than the hundred-thousandth part of an inch.
Pagina xv - Were I to assume an hypothesis, it should be this, if propounded more generally so as not to determine what light is, further than that it is something or other capable of exciting vibrations in the aether ; for thus it will become so general and comprehensive of other hypotheses as to leave little room for new ones to be invented...
Pagina xxx - Now the different magnitude of the hole in the window-shut, and different thickness of the prism where the rays passed through it, and different inclinations of the prism, to the horizon, made no sensible changes in the length of the image. Neither did the different matter of the prisms make any : for in a vessel made of polished plates of glass cemented together in the shape of a prism and filled with water, there is the like success of the experiment according to the quantity of the refraction.
Pagina xv - I spake of the nature of light and colours abstractedly, have readily apprehended it when I illustrated my discourse by an hypothesis ; for this reason I have here thought...
Pagina xi - And in like manner, when a ray of light falls upon the surface of any pellucid body, and is there refracted or reflected, may not waves of vibrations, or tremors, be thereby excited in the refracting or reflecting medium at the point of incidence...
Pagina x - Tis true, that from theory I argue the corporeity of light ; but I do it without any absolute positiveness, as the word . perhaps ' intimates ; and make it at most but a very plausible consequence of the doctrine, and not a fundamental supposition, nor so much as any part of it."— {Phil.
Pagina xi - ... and are not these vibrations propagated from the point of incidence to great distances ? And do they not overtake the rays of light, and by overtaking them successively, do they not put them into the fits of easy reflexion and easy transmission described above ? For if the rays endeavour.
Pagina iv - as real as the motion of translation by which light is propagated through space. Both must essentially be combined in any correct conception we form of light. That this alternating motion must have reference to certain directions transverse to that of the ray is equally established as a consequence of the phenomena ; and these two principles must form the basis of any explanation which can be attempted.

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