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The top of this instrument is fitted with lenses and mirrors. Down through the shaft of the periscope are other mirrors, which pass along any image reflected on the uppermost mirror of all. At the bottom of the periscope is the last mirror of the series, and, opening in upon this, there is an eyepiece fitted with a lens.
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.
Married at thirteen to the future hero of Rocroy and Lens, both before marriage and again more strongly after, the young Duke had protested by a formal act that he yielded only to compulsion and his respect for paternal authority in giving her his hand.
Also it may not be generally known that he who carries a watch carries a "burning glass" with which he can, in clear weather, produce fire at will. This forms a lens which, held steadily, will easily ignite any light, dry, inflammable substance. When firearms are carried, cut a cartridge so that only about a quarter of the charge of powder remains.
As we have seen this process, a closet is arranged as a camera-obscura, and the enlarged image is thrown down through a lens above on a sheet of sensitive paper placed on a table capable of being easily elevated or depressed.
We have all seen the beautiful play of colors on the soap bubble, or when the drop of oil spreads over the surface of the water. Place a lens of long curvature on a piece of plane polished glass, and, looking at it obliquely, a black central spot is seen with rings of various width and color surrounding it.
I will select the spot from which the photograph is to be taken, and will focus the camera, stop down the lens to the extent required to get satisfactory definition, and generally arrange the picture; and all that you will need to do will be to remove the cap and give the proper exposure when I am ready.
But all of a sudden I thought of what Serenus said about a woman twice my size dressed in gaudy red, forever takin' after folks What would Josiah do if she took after him? And no doubt she would, for looked at through the magnifying lens of Absence and Anxiety he looked passingly beautiful. As I thought of her I knowed what I would do.
As the blinding lens of the sun glittered level and its first rays poured over tree and rock, a man in the faded field-uniform of a Swiss officer of mountain artillery came out on the misty ledge across the chasm. "You over there!" he shouted in English. "Here is a Swiss officer to speak with you! Show yourselves!" Again, after waiting a few moments, he shouted: "Show yourselves or answer.
So hot that her husband, even when the sun was as low as this, could light his pipe with a burning-glass a telescope lens whose tube had gone astray, to lead a useless life elsewhere.
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