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Updated: June 18, 2025
Even the undulatory hypothesis does not account for all the phenomena of light. The natural colors of objects, the compound nature of the solar ray, the absorption of light, and its chemical and vital action, the hypothesis leaves as mysterious as it found them; and some of these facts are, at least apparently, more reconcilable with the emission theory than with that of Young and Fresnel.
The doctrine of Young and Fresnel was as a highway leading surely on to the wide plain of conservation. The phenomena of electro-magnetism furnished another such highway. But there was yet another road which led just as surely and even more readily to the same goal.
But this conception of the ether to which we are led by Mach's way of thinking differs essentially from the ether as conceived by Newton, by Fresnel, and by Lorentz. Mach's ether not only conditions the behaviour of inert masses, but is also conditioned in its state by them. Mach's idea finds its full development in the ether of the general theory of relativity.
"What do you want now?" Fresnel demanded angrily. "Haven't I told you that I..." He broke off short. The muzzle of the pistol was within a foot of his eyes. "I want the key of the boat. That is all, Fresnel. And you can either give it me at once, or I'll take it after I have burnt your brains. I should regret to kill you, but I shall not hesitate.
"Why, is it different from common light-houses?" carelessly inquired Caleb. "Don't you know? Haven't you come on purpose to see it?" asked the keeper, in astonishment, and then proceeded to explain, that this is the famous Fresnel light, the identical structure exhibited at the great Exposition at Paris, bought there by an agent of the United States, and shipped by him to America.
The command of the enemy army then devolved onto the Austrian General Fresnel who ordered a retreat, and the French army continued on its way peacefully towards the Rhine.
The position of every band of light and shade in such figures has been calculated from theory by Fresnel, Fraunhofer, Herschel, Schwerd, and others, and completely verified by experiment. Your eyes could not tell you with greater certainty of the existence of these bands than the theoretic calculation.
It is your life against mine, Fresnel; and you'll not find it strange that if one of us must die I prefer that it shall be you." Fresnel dipped a hand into his pocket, and fetched thence a key. He held it out to Andre-Louis in fingers that shook more in anger than in fear. "I yield to violence," he said, showing his teeth like a snarling dog. "But don't imagine that it will greatly profit you."
When all had looked, the guide slowly closed his hand with a cruel gripe, and, opening it, threw down a little shower of scintillating dust, an airy fall of powdered diamonds, lost as they readied the earth, and that was all. "We're casting some of those Fresnel lanterns to-day.
Very remarkable experiments on dispersion by M. Carvallo prove indeed that the idea of Fresnel was, if not necessary for us to adopt, at least the more probable of the two; but apart from this indication, and contrary to the hypothesis of Neumann, the two theories, from the point of view of the explanation of all known facts, really appear to be equivalent.
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