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Updated: June 9, 2025
It is plain that earlier American writing interests us only in a local and guarded sense. The critical microscope discovers certain merits; but the least shifting of the eye-piece throws the object out of field. We value what these men wrote because of what they did as Americans, or stood for in American life. Of Irving and a few later writers this is not true.
First, as to the general principles involved, it is generally known that the really vital parts of the telescope, which by their combined action perform the office of magnifying the object looked at, are two in number, the OBJECTIVE and the EYE-PIECE. The former brings the rays of light which emanate from the object to the focus where the image of the object is formed.
'Sides, he wouldn't come through here submerged, with only his periscope dipping." "It's a Fritz, then," said the Lieutenant, an ominous calm in his voice. He stepped aside and relinquished the eye-piece. "It is," said the other. "It's a naughty, disobedient Fritz. He's coming through in broad daylight, which he's been told not to do. He hasn't seen us yet he's watching old man Gedge.
The eye-piece enables the observer to see this image to the best advantage. The functions of the objective as well as those of the eye-piece may, to a certain extent, each be performed by a single lens. Galileo and his contemporaries made their telescopes in this way, because they knew of no way in which two lenses could be made to do better than one.
We present several figures showing how these spectral images, as they are sometimes called, will appear; first, when the eye-piece is pushed in, and secondly, when it is drawn out, with telescopes of different qualities. We have thus far spoken only of the refracting telescope, because it is the kind with which an observer would naturally seek to supply himself.
The sound is repeated all along the trench, and in two minutes every man is in his place, cowled like a member of the Holy Inquisition, glaring through an eye-piece of mica, and firing madly into the approaching wall of vapour.
I don't know what there was in those few words, but I noticed that for a minute or two after they, were uttered I heard the ticking of the clock-work that moved the telescope as clearly as if we had all been holding our breath, and listening for the music of the spheres. The Young Girl kept her eye closely applied to the eye-piece of the telescope a very long time, it seemed to me.
He stood back and helped Daisy to take a kneeling position in her chair, so that her eye could reach the eye-piece of the microscope. Daisy looked, took her eye away to give a wondering glance of inquiry at her friend's face, and then applied it to the microscope again; a pink hue of delight actually spreading over her poor little pale cheeks. It was so beautiful, so wonderful.
It concerns a promise" he lowered his voice till it was barely audible above the noise of the machinery "to my betrothed." For the first time von Sperrgebiet turned his face from the rubber eye-piece and regarded the youth with a little mocking smile that showed only a sharp dog-tooth. "Don't say you promised to introduce her to me, Ludwig!" he sneered. "No, no," said the other hastily.
Each inner circle corresponded to a diameter reduced by one second. By means of a vernier or eye-piece, the diameter of the Sun could be read off the discometer, and from his diameter my distance could be accurately calculated. On the further side of the machinery was a chamber for the decomposition of the carbonic acid, through which the air was driven by a fan.
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