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Yet the conviction persisted in the minds of both Jim and Dennis that some black, invisible force was pouring down those conduits, to be sifted, diffused, and hurled through the lead lenses at the dog in the bell.
The television lenses on the tower would have picked him out in any case, if Kreynborg had repaired the screen. He went boldly up to the rocket-ship. "Kreynborg!" he called. "Kreynborg!" He felt himself being surveyed. A door came open. Kreynborg stood chuckling at him with a pocket-gun in his hand. "Ha! Just in time, my friend! I haff been fery busy.
In his pockets his hands manipulated tiny controls, and through the lenses of those goggles Costigan's keen and highly-trained eyes studied every concealed detail of mechanism of the great globe, the while he planned what must be done. Finally, he took off the goggles and spoke in a low voice to Bradley, confined in another windowless room across the hall. "I think I've got dope enough, Captain.
The basis of successful work is a good lens, which is really the eye of the camera. In selecting it we should get just as good a one as we can afford. There are a great many excellent makes of lenses on the market and even the stock types that are supplied with moderate-priced cameras are of very good quality.
In the course of experiments on light, directed towards the perfecting of his achromatic lenses, Fraunhofer, by means of a slit and a telescope, made the surprising discovery that the solar spectrum is crossed, not by seven, but by thousands of obscure transverse streaks. Nor did he stop here.
This cover is composed of over six hundred pieces of glass, arranged in a complicated and scientific system of lenses and prisms, very difficult to comprehend, but very beautiful in the result; for every ray of light from that brilliant flame is shivered into a thousand glittering arrows, reflected, refracted, tinted with all the rainbow hues, and finally projected through the clear plate-glass windows of the lantern with all the force and brilliancy of a hundred rays.
"Sometimes the thrust of wind up the ravine would produce a tremulous motion in the image at the focus of the mirror; but this was seldom. For the most part the wonderful lenses presented a steady curvature, not flawless, but of magnificent capacity. "Now it flashed upon me that, when the moon was at the full, she would top the valley in the direct path of my telescope's range of view.
Real space, real time, real numbers, real connections, real weights are lost. The perspective and the background and the dimensions of action are clipped and frozen in the stereotype. BUT the human mind is not a film which registers once and for all each impression that comes through its shutters and lenses. The human mind is endlessly and persistently creative.
Chromatic Aberration is another difficulty that opticians have to contend with in the manufacturing of lenses. It will be remembered, that in a former page a beam of light is decomposed by passing through a glass prism giving seven distinct colors red, orange, yellow, green, blue, indigo and violet.
Lizzie had smiled, and shaken her head slightly, looking at the battered rubbish in the bag the little, tarnished mirrors, one of them cracked; the two small lenses, scratched and dim; the handful of rusty cogs and wheels. With what passion he had dreamed that he would see that which it hath not entered into the heart of man to conceive!
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