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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.
He was of Anglo-Hungarian extraction, and I have always fancied something Mongolian in his type. He peered up with reddish swollen-looking eyes over gilt-edged glasses that were divided horizontally into portions of different refractive power, and he talking in an ingratiating undertone, with busy thin lips, an eager lisp and nervous movements of the hand.
It will presently be seen that the discussion bears importantly on the opinion we are to form of the skill and attainments of the pyramid architects. Every celestial object is apparently raised somewhat above its true position by the refractive power of our atmosphere, being most raised when nearest the horizon and least when nearest the point vertically overhead.
Reese's Manual of Toxicology. If an eye removed from its socket be stripped posteriorly of the sclerotic coat, an inverted image or the field of view will be seen on the retina; but if the lens or other part of the refractive media be removed, the image will become blurred or disappear altogether.
It was too far off to enable me to remark its outline; yet on straining my sight the atmosphere being very exquisitely clear I thought I could distinguish the projections of peaks, of rounded slopes, and aerial angularities in places which, in the refractive lens of the air, looked, with their hue of glassy azure, like the loom of high land behind the coastal line.
Probably, however, though they noted the time of rising and setting of the celestial bodies, they only made instrumental observations upon them when these bodies were high in the heavens. Thus they remained ignorant of the refractive powers of the air. For the lower the latitude the higher is the noonday sun at any given season.
They also possessed the art of making glass highly refractive. Their table-ware surpassed in beauty all that I had ever previously seen. I saw tea cups as frail looking as soap bubbles, possessing the delicate iridescence of opals. Many other exquisite designs were the product of its flexibility and transparency.
And if you will consider only a second, you will see also that the powder of glass might be made to vanish in air, if its refractive index could be made the same as that of air; for then there would be no refraction or reflection as the light passed from glass to air." "Yes, yes," said Kemp. "But a man's not powdered glass!" "No," said Griffin. "He's more transparent!" "Nonsense!"
Combining mathematical knowledge with mechanical ingenuity, and having the practical aid of the celebrated optician Tulley, he devised formulae for the combination of lenses of crown glass with others of flint glass, so adjusted that the refractive errors of one were corrected or compensated by the other, with the result of producing lenses of hitherto unequalled powers of definition; lenses capable of showing an image highly magnified, yet relatively free from those distortions and fringes of color that had heretofore been so disastrous to true interpretation of magnified structures.
Between the two prisms a double refractive lens was now placed, in this case a double concave lens of selenite, when the same series of concentric rings observed with the film of air was obtained on the screen, only much more intense, while a wedge of selenite gave the bands of color in the same order as with the soap bubble.
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