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Updated: May 11, 2025
I refer to the use of dioptric media which correct the diminished refracting power of the humors of the eye, in other words, spectacles. I don't use them. All I ask is a large, fair type, a strong daylight or gas-light, and one yard of focal distance, and my eyes are as good as ever. But if YOUR eyes fail, I can tell you something encouraging.
Are you convinced, or do you hanker after tests like polarized light and refracting liquids?" Sir Thomas had staggered to a chair. "So, that was how you knew!" he said. "That was " began Jimmy, when a sudden suspicion flashed across his mind. He scrutinized Sir Thomas' pallid face keenly. "Did you know?" he asked. He wondered that the possibility had not occurred to him earlier.
They had raised a subject no other than the question whether highwaymen are necessarily or generally possessed of true courage. Very absurd, no doubt, but as good for a wrangle as any other that can be divided into affirmative and negative by the refracting medium of feeling or prejudice. S th declared them all to be cowards. "What say you to Cartouche?" said S k; "was he a coward?"
The only mode, therefore, of prosecuting this inquiry is that afforded by the Method of Agreement; by which, in fact, through a comparison of all the known substances which have the property of doubly refracting light, it was ascertained that they agree in the circumstance of being crystalline substances; and though the converse does not hold, though all crystalline substances have not the property of double refraction, it was concluded, with reason, that there is a real connection between these two properties; that either crystalline structure, or the cause which gives rise to that structure, is one of the conditions of double refraction.
On the morning of our departure we climbed a high lull of limestone, covered in places with patches of a limestone-breccia, cemented with sandstone, and filling the cavities in the rock. All over the hill we found doubly refracting Iceland-spar in quantities. Euphorbias, in Europe mere shrubs, were here smooth-limbed trees, with large flowers.
But while these, without subsidence, passed, absorbed by Brahm, the light of Iran, deflecting, persisted, and so potently that it lit the Teutonic sky, glows still in Christendom, after refracting perhaps in Inca temples. Its revelation is due to Zarathrustra. Zarathrustra, commonly written Zoroaster, is a name translatable into "star of gold" and also into "keeper of old camels."
In ponderable matter it acts as if its density were increased without a proportionate increase of elasticity; and this accounts for the diminished velocity of light in refracting bodies. We here reach a point of cardinal importance.
"When a beam of light passes through a refracting surface, especially if imperfectly polished, a portion of it is irregularly scattered, and makes the surface visible in all directions, but most conspicuously in directions not far distant from that of the light itself; and if a reflecting surface be placed parallel to the refracting surface, this scattered light, as well as the principal beam, will be reflected, and there will be also a new dissipation of light, at the return of the beam through the refracting surface.
If nothing short of the marvellous is to satisfy us, who shall say that even this will not present itself to the far-piercing ken of the new monster telescope refracting, not reflecting established on Wandsworth Common, at the cost of an amateur astronomer, for the promotion of the celestial science?
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.
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