He had seen Carleton use a transit, and had had a dim suspicion at the time that the superintendent was looking through the eyepiece while it was closed.
Now, Captain Joe, look through thiseyepiece and see if you find the red quartered target in the centre of the spider-web lines.
Figure 28 is a section of a Galilean telescope which differs from the astronomical telescope in having a double concave instead of a double convex, eyepieceor ocular.
From the eyepiece (E) the rays emerge in a cone of pencils of light smaller than the pupil of the eye, which enables a telescope of this type to have a large field of view.
The power of a telescope or a field glass can more accurately be measured by means of a dynameter, which is a microscope which can be fitted over the eyepiece end of the instrument, and which magnifies the image.
This method is not applicable in the case of the Galilean telescope or the field glass consisting of two Galilean telescopes, due to the fact that the rays from the eyepiece of the Galilean telescope are divergent.
The end of the dynameter next to the eyepiece of the instrument is ruled with a series of lines one-hundredth of an inch apart.
Bart squinted through the eyepiece and saw a huge crater with a shadowed spire in its center.
Bart asked as his friend peered through the eyepiece of the telescope and continued his adjustments.
The cross-hairs of the eyepiece were centered on a small circular shadow near its inner rim.
And then he saw the eyepiece of the telescope with a lot of red smears on it.
He edged as far as he could between the wooden seat and the eyepiece of the instrument, and turned his body round so that it was chiefly his feet that were exposed.
A number of his technical experts awaited him at the eyepiece of the great telescope.
He turned to theeyepiece of the telescope and swung the instrument around to bear on the Earth.
Westfall, staring into the eyepiece of the filar micrometer, finished measuring the apparent size of the heptagon before he turned toward Stevens and Brandon.
He lowered the periscope till the eyepiece was level with the deck, and stood drumming his fingers against the hoisting wires.
The Captain swung the periscope round, wiped the eyepiece with a nominally clean chamois-leather pad, and then leaned back against the diving gauge, finishing the fag-end of a cigarette.
Erecting eyepiece, an eyepiece used in telescopes for viewing terrestrial objects, consisting of three, or usually four, lenses, so arranged as to present the image of the object viewed in an erect position.
A small concave mirror in the axis of this telescope, having its focus coincident with that of the large reflector, transmits the light received from the latter back through a hole in its center to the eyepiece placed behind it.
Terrestrial telescope, a telescope whose eyepiece has one or two lenses more than the astronomical, for the purpose of inverting the image, and exhibiting objects erect.
Astronomical telescope, a telescope which has a simple eyepiece so constructed or used as not to reverse the image formed by the object glass, and consequently exhibits objects inverted, which is not a hindrance in astronomical observations.
Telescope sight (Firearms), a slender telescope attached to the barrel, having cross wires in the eyepiece and used as a sight.
Defn: Having all or many degrees of power; having a great range of power; -- said of an eyepiece made adjustable so as to give a varying magnifying power.
Defn: The eyepiece of an optical instrument, as of a telescope or microscope.
Kennedy paused long enough to look through theeyepiece again as if to reassure himself finally that he was right.
At one end was a lamp; the other was fitted with an eyepiece like a telescope.
Carefully he lighted the lamp, then squinted through the eyepiece at the tube of liquid containing what he had derived from the cartridge.
Now, in the Crossley reflector, the upper edge of the plate and the guidingeyepiece are just about 3-2/3 inches, or 1 deg.
An old negative, from which the film has been partially scraped, is placed in one of the plate-holders, and the film is brought into the common focus of the eyepiece and the great mirror.
Roberts, in laying down the conditions which should be fulfilled by a good photographic telescope, says that a star should remain bisected by a thread in the eyepiece for two minutes at a time.
In this apparatus, as originally constructed, the cross-wires of the guiding eyepiece were exactly in the plane of the photographic plate.
The image of a star in the guiding eyepiece, which, when in the middle of its slide, is nearly three inches from the axis of the mirror, is not round, and its shape varies as the eyepiece is pushed in or drawn out.
The guiding eyepiece slides freely when not held by a clamp.
The part played by the eyepiecein determining magnifying power will be readily understood from the following experiment: Make a pin hole in a piece of cardboard.
Higher powers can be used with large telescopes than with small ones, but it is seldom advantageous to use with any telescope an eyepiece giving a higher power than 60 diameters for each inch of diameter of the objective.
F is about 16 times as great as the distance of the eyepiece from the same plane, and the magnifying power of this telescope is therefore 16 diameters.
The equivalent focal length of a positive or Ramsden eyepiece is equal to three fourths of the focal length of either of the lenses.
Next we shall need a rather low-power eyepieceand our largest aperture in order to examine a star cluster, No.
It should be remembered that a telescope, unless a terrestrial eyepiece or prism is employed, reverses such an object as the moon top for bottom.
Then, by placing a sheet of paper or a drawing board before the eyepiece and focusing the image of the sun upon it, very good results may be obtained.
Next let us return to the focus and then move the eyepiece gradually inside the focal point or plane.
Suppose we turn it in such a way that theeyepiece moves slightly outside the focus, or away from the object glass.
Suppose, for example, we observe that the image of a star instead of being perfectly round is oblong, and that a similar defect appears in the form of the rings when the eyepiece is put out of focus.
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.
In this kind ofeyepiece the image is formed between the two lenses, and if the work is properly done such an eyepiece is achromatic.
Without a good eyepiece the best telescope will not perform well.
Upon continuing to move the eyepiece inside or outside the focus we observe that the system of rings becomes larger, while the rings themselves rapidly increase in number, becoming at the same time individually thinner and fainter.
The Huygens eyepiece consists of two plano-convex lenses whose focal lengths are in the ratio of three to one.
The equivalent focal length of a negative or Huygens eyepiece is equal to half the focal length of the larger or field lens.
If the oblong image does not turn round with the eye, but does turn when the eyepiece is twisted round, then the astigmatism is in the latter.
In the Ramsden eyepiece two plano-convex lenses are also used, but they are of equal focal length, are placed at a distance apart equal to two thirds of the focal length of either, and have their convex sides facing one another.
The lieutenant-commander watched the seemingly monotonous changing panorama depicted upon the bowl at the base of the periscope, as the eyepiece swept the horizon.
For a brief instant the eyepieceof the periscope was turned in the direction of the waterlogged boat, then, having slowly and deliberately swept it all round the compass, it again scrutinized the two unfortunate men.
The magnifying eyepiece G magnifies the image so that distant objects appear of natural size.
A hand wheel arranged below the binocular eyepiece permits of easy rotation of the instrument.
In the dark, square chamber at the other end of the instrument, 200 feet away, into which the eyepiece of the instrument opened, I had taken my station with two or three friends.
The eyepiece is then moved inwards and outwards so as to throw the point out of focus.
The images of the sun and moon as they appeared at the primary focus in the eyepiece measured from twenty-one to twenty-two inches in diameter, and the screen projections were magnified from these about thirty times superficially.
Special gearing moved this truck-like construction backwards and forwards to bring a sharp focus into the eyepiece or on to a photographic plate.
A refracting telescope is one of the ordinary pocket type, having an object-lens at one end and an eyepiece at the other.
The eyepiece section consisted of a short tube, of the same breadth as the main tube, resting on four wheels that travelled along rails.
Only experience and actual trial will teach the observer to choose the particulareyepiece suitable for a given night or a given object.
An instrument on the principle of Dawes' solar eyepiece has been suggested; this, if used with an invariable and absolute scale of tints, would remove many difficulties attending these investigations.
Meanwhile some of the men engaged in the work had improved the eyepiece by providing it with an aluminum mounting.
He adjusted the eyepiece and looked, focussing with the handles.
When the Captain had called “Up, periscope,” the long shaft had moved up by electric motor until the eyepiece and handles were at convenient height.
Amidship, Kass was again studying the eyepiece of the ampliscope.
The man at the ampliscope removed his head from the eyepiece and shook his head impatiently.
The eyepiece C is then shifted until some point of the cloud image, as seen through the eyepiece, is projected on the intersection of the cross lines on the glass.
The height of the cloud above the horizon is found by reading the position of the eyepiece on the divided quadrant.
The best method of observing directions of cloud movement is to note the path of the reflection of the cloud in a horizontal mirror, the observer looking at this reflection through an eyepiece which remains fixed during the operation.
While he watched, the doctor swiveled out another eyepiece for his own use and turned a knob on the side of the machine.
Sit up and take a look," said Kessler, bending the eyepiece around so Bolden could use it.
The eyepiece slid into the microscreen and, starting at the finger tips, Kessler examined the arm, traveling slowly upward.
The eyepiece E views the image of the slit S which is formed at F.
Having secured our object exactly as we wish it to be depicted and well in the centre of the illuminated circle, we remove the eyepiece and slip the metal camera over the top of the microscope tube.
This tube is designed to hold the lenses, the objective at its lower end, the eyepiece at its upper end.
The form of eyepiece most usually met with is known as Huyghen’s.
He stopped and looked through the eyepieceof the extraordinary vision apparatus.
He went back into the laboratory and put his eye to the eyepiece of the dimensoscope.
Tommy instantly put his eye to the eyepiece again.
Tommy was about to leave the eyepiece of the instrument when a movement nearby caught his eye.
He did not see Von Holtz looking in the eyepiece of the dimensoscope.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "eyepiece" in a variety of sentences. We hope that you will now be able to make sentences using this word.
