Vietnam or Thailand ? Vote for the TOP Country of the Week !
Updated: April 30, 2025
On a nearer approach, the phantom disappeared and a clear and open sea again presented itself to our view. The fact was, that the refractive power upon the coast had elevated the sand-hillocks above their true position, since we satisfactorily ascertained that they alone separated the lake from the ocean, and that they alone could have produced the semblance we noticed.
In many parts of the world that night a pallid halo encircled it about. It was perceptibly larger; in the clear refractive sky of the tropics it seemed as if it were nearly a quarter the size of the moon. The frost was still on the ground in England, but the world was as brightly lit as if it were midsummer moonlight.
They may use up all the protoplasm of the rod in their formation, or they may use only a small part of it, the rod which forms them continuing its activities in spite of the formation of the spores within it. They are always clear and highly refractive from containing little water, and they do not so readily absorb staining material as the ordinary rods.
By preparing prisms of different varieties of tabasheer, Brewster proceeded to determine its refractive index, arriving at the remarkable result that tabasheer "has a lower index of refraction than any other known solid or liquid, and that it actually holds an intermediate place between water and gaseous bodies!"
In the books the books that tramp has hidden there are marvels, miracles! But this was not a method, it was an idea, that might lead to a method by which it would be possible, without changing any other property of matter except, in some instances colours to lower the refractive index of a substance, solid or liquid, to that of air so far as all practical purposes are concerned."
In many parts of the world that night a pallid halo encircled it about. It was perceptibly larger; in the clear refractive sky of the tropics it seemed as if it were nearly a quarter the size of the moon. The frost was still on the ground in England, but the world was as brightly lit as if it were midsummer moonlight.
He thought he understood how eye-strain and difference of refractive power of the layers of heated air, or reflected light from the ground and such physical considerations could cause these illusions. But what he could not understand was how it came about that several men would experience exactly the same illusion.
This excessively low refractive power Brewster believes to afford a complete explanation of the extraordinary behavior exhibited by tabasheer when wholly or partially saturated with fluids.
I. But the refractive power of the diamond is so immense, that the image will be formed within the lens. How is that difficulty to be surmounted? Spirit. Pierce the lens through its axis, and the difficulty is obviated. The image will be formed in the pierced space, which will itself serve as a tube to look through. Now I am called. Good-night.
Meyer, indeed, at the Geneva Observatory, detected apparent signs of refractive action upon rays thus transmitted; but his observations remain isolated, and were presumably illusory. The track pursued by this comet gave peculiar advantages for its observation.
Word Of The Day
Others Looking