A refracting telescope is one of the ordinary pocket type, having an object-lens at one end and an eyepiece at the other.
Glass is the substance most commonly used for refracting the rays of light in optical work, the glass being worked up into different forms according to the purpose for which it {128} is intended.
In precisely a similar manner an image is formed at the focus of the object glass of a refracting telescope.
From this follows the most striking difference in the method of using refracting and reflecting telescopes.
In what is said above I refer, of course, to the refracting telescope, which is the form of instrument that I should recommend to all amateurs in preference to the reflector.
In other words, you have constructed a simple refracting telescope.
A refracting telescope which has been freed from the effects of chromatic aberration is called achromatic.
Though not the inventor, he was the first to construct a refracting telescope and apply it to astronomical research.
Refracting astronomical telescopes are now constructed on this principle, it having been discovered that for observational purposes they possess several advantages over the Galilean instrument.
Observations were made of transits of Mercury and Venus, and refracting and reflecting telescopes were invented.
It is seen (ignoring exceptional cases) that the pencil does not meet he refracting or reflecting surface at right angles; therefore it is astigmatic (Gr.
Consequently the monochromatic class includes the aberrations at reflecting surfaces of any coloured light, and at refracting surfaces of monochromatic or light of single wave length.
The concurrence of high refracting power with inflammability was an empirical law; and Newton, perceiving the law, extended it to the adjacent case of the diamond.
Besides, notwithstanding the apparent superiority of the Earth's disc, the refracting power of the atmosphere will never allow the Sun to be eclipsed altogether.
Even the stars blazed with a new and unequalled splendor, and, in the absence of a refracting atmosphere, they flamed as bright in the close proximity of the Moon as in any other part of the sky.
The law of “refracted rays” (the constancy of the ratio between the sines of incidence and of refraction for each refracting substance) was ascertained by direct measurement, and therefore by the Method of Agreement.
By the perpendicular is meant a line, at right angle with the refracting surface.
Such, or very similar, would be the representation on the retina, unassisted by the refracting humours.
Light is decomposed by the prism, because its component parts are refrangible in different degrees, by the same refracting medium.
What advantages, do reflecting, possess over refracting telescopes?
I do not understand the use of these refracting humours: the image of objects was represented in the camera obscura, without any such assistance.
But since the eye absolutely requires refracting humours, in order to have a distinct representation formed on the retina, why is not the same refraction equally necessary, for the images formed in the camera obscura?
True; but I do not yet well understand, how the refracting humours, remedy this imperfection.
It may also be produced by the refraction of light from several refracting surfaces acting upon the pencil of light in succession; as by a bundle of plates of glass.
The light-refracting gem, which glistens on the neck of beauty, and is valued for its transparency, differs only from the rude lump of coke in its molecular arrangement.
Let us expose this fluid to such circumstances that the water will slowly evaporate, and we shall find forming in it, after a time, microscopic particles of solid, light-refracting matter.
We have the diamond with its beautiful light-refracting property, its hardness and high specific gravity, capable of being converted into graphite and coke.
These two causes of diminished light not existing in a refracting telescope, it would give, under parity of dimensions, four times more[19] light than a Newtonian or Gregorian telescope gives.
Refracting telescopes were still ill understood instruments, the result of chance, devoid of certain theory, when they already served to reveal brilliant astronomical phenomena.
The largest refracting telescope which the Clarks had yet constructed was one for the University of Mississippi, which, on the outbreak of the civil war, had come into the possession of the Astronomical Society of Chicago.
Mr. Hilgard replied that the statement was quite correct, the observatory having been equipped at a time when the construction of great refracting telescopes had not been commenced, and even their possibility was doubted.
It is still an open question, perhaps, whether a great refracting telescope will last unimpaired for an indefinite length of time.
The world's work in astronomy was done mainly with refracting telescopes.
At that time Cooke and Clark were the only two men who had ever succeeded in making refracting telescopes of the largest size.
Water exerts a stronger refractingpower than air; and if a ray of light fall upon a body of this fluid its course is changed, as may be seen by reference to Fig.
The refraction is more or less, and in all cases in proportion as the rays fall more or less obliquely on the refracting surface.
On entering from air into a more highly refracting substance, such as glass or water, or the sulphide of carbon, all the waves are retarded, but the smallest ones most.
Sent through a refracting prism, the waves of the sun are turned aside in different degrees from their direct course, the red least, the violet most.
When a body is in the zenith, since a ray of light from it enters the atmosphere at right angles to the refracting medium, it suffers no refraction.
Since it is so much easier to make large reflecting than large refracting telescopes, you may ask, why the latter are ever attempted, and why reflectors are not exclusively employed?
When the lens is used to form an image, the instrument is called a refracting telescope; when a concave mirror is used, it is called a reflecting telescope.
The great reflecting telescope of Lord Rosse, and the powerful refracting telescopes of Pulkova and Cambridge, have opened new fields of discovery to the delighted astronomer.
It may be added that Thomas Cooke revived the art of making refracting telescopes in England.
A contest had long prevailed among telescope makers as to who should turn out the largest refracting instrument.
In 1882, he supplied the Russian Government with the largest refracting telescope in existence the object-glass being of thirty inches diameter.
This refracting telescope did not long remain the largest.
It is capable of being polarized by prisms of double-refracting spar.
It would be interesting to trace the long contest for supremacy between refracting and reflecting telescopes, each of which, at certain stages in its development, appeared to be unrivalled.
A refracting telescope consists of an object-glass composed of two or more lenses, mounted at the upper end of a tube, which is pointed at the celestial object.
Fresnel devised many improvements in which he used refracting and reflecting prisms for the outer elements.
The early lights were not equipped with either reflecting or refracting apparatus.
In the next section refracting prisms may be used and in the outer section reflecting glass prisms are employed.
No part of the tissue is doubly refractingin the fresh state.
Medusa muscle is not doubly refracting, but then none that I have here seen is striated, and unstriated muscle is not doubly refracting anywhere, is it?
The peculiarity is not due to the transparency of the tissue, for I find that the muscular fibre of the transparent osseous fish Leptocephalus is as doubly-refracting as could be wished.
We know it to be on its travels, glancing and refracting from every object which it touches.
The picture or the poem then becomes the surface, refracting the idea which stretches on into infinity.
It had been supposed that the reason why success had not been attained in the construction of a refracting telescope was due to the fact that the object glass, made as it then was of a single piece, had not been properly shaped.
It may, however, be mentioned that the kind of instrument which Herschel designed to construct was formed on a very different principle from the refractingtelescopes with which we are ordinarily familiar.
In this way Newton accounted for a great part of the difficulties which had hitherto beset the attempts to construct a perfect refracting telescope.
The only known method for getting over the peculiar difficulties presented in the construction of the refracting telescope, was to have it of the most portentous length.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "refracting" in a variety of sentences. We hope that you will now be able to make sentences using this word.
