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Updated: June 9, 2025
There's always the distorting lens of one's own mind to be taken into consideration; quite often there's another fellow's: the eye-piece of the compound microscope, and the objective. Take them away, and what impression do you get?" The doctor pulled himself abruptly out of his harangue.
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.
This done, having applied the eye to the eye-piece and directed all his attention to the telescopic image of the advertisement, Herschel did not perceive that the taking away and then replacing the screen made the least change in the brightness or definition of the letters.
J. Simms a reflecting eye-piece for our great equatorial. The eye-piece was completed about the end of January last, and at the first good opportunity I turned the telescope on the Sun. "I may state that my impression was, and it appears to have been the impression of several of the assistants here, that the willow leaves stand out dark against the luminous photosphere.
For a telescope which has no micrometer, the Huyghenian or negative eye-piece, as it is commonly called, is the best. As made by Huyghens, it consists of two plano-convex lenses, with their plane sides next the eye, as shown in the figure. So far as we have yet described our telescope it is optically complete.
Von Sperrgebiet glanced at the compass and moved to the eye-piece of the periscope. For a while there was silence, broken only by the hum of the motors. The Second-in-Command hung about the elbow of the motionless figure at the periscope like a morbid-minded urchin on the outskirts of a crowd that gathers round a street accident, but can see nothing.
Sir William drew his watch from his pocket and walked over to the compass. "In four minutes' time," he said, "I shall start making observations: according to our arrangements Gedge should start the experiment then." "That's right," said the Lieutenant-Commander with his eyes pressed against the eye-piece of the periscope. "Oh, good! It's bales of hay floating, not baskets.
A slit and an eye-piece are alone needed to view it, and absorption of light by glass lenses is obviated an advantage especially sensible in dealing with the ultra- or infra-visible rays. The high qualities of Rowland's great photographic map of the solar spectrum were thus based upon his previous improvement of the instrumental means used in its execution.
The advantage derived by him for bringing it into view, from the insertion into the eye-piece of a uranium film, gives, with its photographic intensity, valid proof that a large proportion of the light of this remarkable object is of the ultra-violet kind. The beginning thus made was quickly followed up.
A pencil and a small bead are so connected together by means of a thread passing over pullies, that if a person, looking through an eye-piece, will hold the pencil upon a sheet of paper, and then, watching the bead, will move his hand, so that the bead shall trace the lines of any object that is selected or looked at, he will find that, whilst he has been doing this, he has also made a drawing of the subject upon the paper; for the pencil and the bead describe exactly the same lines, though upon different planes.
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