United States or Niger ? Vote for the TOP Country of the Week !
Anger at defeat burned through Brion. Even faced with failure, he refused to accept it. He reached over her shoulder and savagely twisted the turret of microscope until the longest lens was in position. "If you can't see anything try the high power! It's there I know it's there! I'll get you a tissue specimen." He turned back to the disemboweled cadaver.
By means of the spectroscope, which is essentially a magnifying lens attached to a prism of glass, it is possible to locate the lines with great accuracy, and it was soon shown that here was a new means of chemical analysis of the most exquisite delicacy.
Among others who served in the Seventh Regiment of New York, of which Theodore Winthrop was a member, was Fitz-James O'Brien, the erratic and brilliant journalist, whose tale of The Diamond Lens was his best contribution to the literature of the day.
In order to ascertain the magnifying power which an eyepiece gives when applied to a telescope it is necessary to know the equivalent, or combined, focal length of the two lenses. Two simple rules, easily remembered, supply the means of ascertaining this. The equivalent focal length of a negative or Huygens eyepiece is equal to half the focal length of the larger or field lens.
In the most celebrated battles of these times, Rocroi, Nordlingen, Lens, Rethel and the Dunes, we see the infantry work in this way. The two armies, in straight lines, commenced by bombarding each other, charged with their cavalry wings, and advanced with their infantry in the center.
Being quite a skillful operator with the lens and the shutter, Will could judge these things much better than any of his chums. In a case of this kind at least he had no occasion to ask the advice of Frank. The latter in the meanwhile was looking from window to window of the two-story building. It must have many rooms, he judged, from the number of these openings.
"There is my mamma's mother, two centuries old, and still studying. I paid her a visit the other day and she took me into her laboratory. She is a manufacturer of lenses, and has been experimenting on microscopes. She has one now that possesses a truly wonderful power. The leaf of a pear tree, that she had allowed to become mouldy, was under the lens, and she told me to look.
I put my eye to the eye-piece and gazed through the bulging lens of the other end. I could see almost the whole hall. "That," he explained, "is what is known as a fish-eye lens a lens that looks through an angle of some 180 degrees, almost twice that of the widest angle lens I know of." I said nothing, but tossed my own crude invention into the corner, while Craig went back to work.
This marvellous instrument, we need hardly remind our readers, is of two distinct kinds that in which light is gathered together into a focus by refraction, and that in which the same end is attained by reflection. The image formed is in each case viewed through a magnifying lens, or combination of lenses, called the eye-piece.
The seeds are used by druggists and rectifiers of spirits, and form many of the cordial drinks. The quantity of seed and produce are similar to those of Caraway. ERVUM Lens. LENTILS. Once cultivated here for the seeds, which are used for soups; but it is furnished principally from Spain, and can at all times be purchased for less than it can be grown for. HORDEUM distichon.
Word Of The Day