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Updated: May 11, 2025
Place a piece of Iceland spar over a dot of ink; two dots are seen, the one appearing nearer than the other to the eye. The nearest dot belongs to the most strongly refracted ray, exactly as the nearest cup-bottom belongs to the most highly refracting liquid. When you turn the spar round, the extraordinary image of the dot rotates round the ordinary one, which remains fixed.
It was lost in the stained glass, checked by dark bishops, and opaque saints completely filling the dusky-bordered windows with the dead hues of a Persian rug; the panes absorbed the sun's rays, refracting none, arrested the powdered gold of the sunbeams in the dull violet of purple egg-fruit, the tawny browns of tinder or tan, the too-blue greens, and the wine-coloured red stained with soot, like the thick juice of mulberries.
Thus it came about that, as the little optic tube of Galilei slowly developed into the giant telescope of Herschel, and then into the powerful refracting telescopes of the United States of our time; as the new science of photography provided observers with a new eye a sensitive plate that will register messages, which the human eye cannot detect, from far-off regions; and as a new instrument, the spectroscope, endowed astronomers with a power of perceiving fresh aspects of the inhabitants of space, the horizon rolled backward, and the mind contemplated a universe of colossal extent and power.
Do you think he eats humble pie and crawls to Madame and lets you stay here for nothing?" The Seigneur was painfully quiet and intent, yet his brain was like some great lens, refracting and magnifying things to monstrous proportions. "A will was found?" he asked. "By Madame in the library. She left it where she found it behind the picture over the Louis Seize table.
In the atmosphere of the Easterly weather, as pellucid as a piece of crystal and refracting like a prism, we could see the appalling numbers of our helpless company, even to those who in more normal conditions would have remained invisible, sails down under the horizon.
Move the two carefully until they are at a distance apart equal to the sum of the focal lengths of the lenses, and you will see a magnified image of the distant object. In other words, you have constructed a simple refracting telescope.
Professor Wood of Johns Hopkins has demonstrated recently the remarkable refracting power of a drop of water, using the camera and the drop of water as a lens. It is especially interesting to scientists because it illustrates the range of vision of some fishes. They have eyes that see over half a circle.
Brightness and freshness take possession of the mind when it is crossed by the light of principles, showing the facts of Nature to be organically connected. Let us, then, inquire what this thing is that we have been generating, reflecting, refracting and analyzing. In doing this, we shall learn that the life of the experimental philosopher is twofold.
A daguerreotype plate was placed at the focus of the 15-inch equatorial, at that time one of the two largest refracting telescopes in the world. Bond received a gold medal at the first international exhibition, that at the Crystal Palace, in London, in 1851. In 1857, Mr.
In what is said above I refer, of course, to the refracting telescope, which is the form of instrument that I should recommend to all amateurs in preference to the reflector. But, before proceeding further, it may be well to recall briefly the principal points of difference between these two kinds of telescopes.
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