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Updated: June 11, 2025
Many opticians, indeed, quite despaired of ever being able to make a satisfactory refracting compound microscope, and some of them had taken up anew Sir Isaac Newton's suggestion in reference to a reflecting microscope.
It has aided discovery in botany, in physiology, in mineralogy, and in almost all other branches of science. It has even assisted in the detection of crime. The large refracting telescopes have been constructed within the last few decades. Telescopes have recently been used with increasing success in photographing the heavens with accuracy.
John Dollond, the son of a Spitalfields weaver, invented the achromatic lens in 1758, removing thereby the chief obstacle to the development of the powers of refracting telescopes; James Short, of Edinburgh, was without a rival in the construction of reflectors; the sectors, quadrants, and circles of Graham, Bird, Ramsden, and Cary were inimitable by Continental workmanship.
"The refracting system is invisible it seems as though nothing intervenes between the eye and the object. You perfected all these things since we left Osnome, Dunark? You are in a class by yourself. I could not even copy them in less than a month, and I never could have invented them." "I did not do it alone, by any means.
Intellectually he divined things like a woman with marvellous rapidity, shrewdness and inaccuracy. He saw into people's souls through a dark refracting suspiciousness. The same bent of mind, the same individuality of distorted insight made him overflow with ingenious explanations of the Bible and the Talmud, with new views and new lights on history, philology, medicine anything, everything.
The most satisfactory conditions under which a general examination can be made is to stand the animal facing a transom, window or open door. We may then look directly into the eye and note the condition of the different refracting media. The lens should appear transparent and free from scars. The aqueous humor free from any cloudiness or precipitate.
Correspondences between the arts such a correspondence, for example, as inspired the famous saying that architecture is frozen music reveal themselves usually only after the sister arts have attained an independent maturity. They owe their origin to that underlying unity upon which our various modes of sensuous perception act as a refracting medium, and must therefore be taken for granted.
He could explain away. Perhaps he might help to extricate, if things had got to that pitch. Should he write to his son? For a time he revolved a long, tactful letter in his mind. But that was impossible. Suppose the trouble was something quite different? It would have to be a letter in the most general terms.... Section 6 It was in the doubly refracting nature of Mr.
And as refraction depends wholly upon the change of velocity on entering the refracting medium, being greatest where the change of velocity is greatest, we have in many crystals two different refractions. By such crystals a beam of light is divided into two. This effect is called double refraction.
It must, of course, be remembered that in those early days the art of constructing the astronomical telescope was very imperfectly understood. 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.
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