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Updated: May 29, 2025
And, since a ray perpendicular to a plane, and coming from a very distant source of light, is nothing else, according to the precedent Theory, than the incidence of a portion of the wave parallel to that plane, I supposed the straight line RC, parallel and equal to AB, to be a portion of a wave of light, in which an infinitude of points such as RHhC come to meet the surface AB at the points AKkB. Then instead of the hemispherical partial waves which in a body of ordinary refraction would spread from each of these last points, as we have above explained in treating of refraction, these must here be hemi-spheroids.
For in the case of rays which, for example, fall parallel upon a spherical surface AFE, intersecting one another, after refraction, at different points, as this figure represents; what can the waves of light be, in this transparent body, which are cut at right angles by the converging rays? For they can not be spherical.
"Barbican is right, friend Michael," observed the Captain slowly: "the same phenomenon occurs on earth every morning at sunrise, when refraction shows us 'the Sun new ris'n Looking through the horizontal misty air, Shorn of his beams."
Our guide saw us measuring the depth of one of them, which was full of greenish-blue water, colored only by the refraction of the light. He took our long alpenstock, and poising it, sent it down into the water, as a man might throw a javelin. It disappeared, but in a few seconds leaped up at us out of the water, as if thrown back again by an invisible hand.
Insanity calls for a closer study than has ever been given and only through a deeper realization of its cause, can a cure be brought about and individuals rendered of value to themselves and the country. Insanity is nothing more or less than disassociated states of mind and need not in reality be any more serious than errors of refraction of vision, faulty locomotion or lack of coordination.
For, the point H having been found and marked, as aforesaid, directly above the point E, I observed the appearance of the line CD, which is made by the extraordinary refraction; and having placed the eye at Q, so that this appearance made a straight line with the line KL viewed without refraction, I ascertained the triangles REH, RES, and consequently the angles RSH, RES, which the incident and the refracted ray make with the perpendicular.
An interesting instance of bi-polarity. Another interesting phenomenon observed to-day was a cirrus cloud lit by sunlight. It was seen by Wilson and Bowers 5° above the northern horizon the sun is 9° below our horizon, and without refraction we calculate a cloud could be seen which was 12 miles high. Allowing refraction the phenomenon appears very possible. Wednesday, May 31.
The last object at which Elizabeth gazed when they renewed their journey, after their encountre with Richard, was the sun, as it expanded in the refraction of the horizon, and over whose disk the dark umbrage of a pine was stealing, while it slowly sank behind the western hills.
The doctor looked attentively, and burst out laughing. "It's the refraction!" he exclaimed. "Only the refraction!" repeated Shandon. But a fearful exclamation from the crew interrupted them. "The dog!" said Clifton. "The dog, captain!" repeated all his comrades. "Himself!" cried Pen; "always that cursed brute." They were not mistaken it was the dog.
Now this proportion, which there is between the line N and CG, may be called the Proportion of the Refraction; similarly as in glass that of 3 to 2, as will be manifest when I shall have explained a short process in the preceding way to find the irregular refractions.
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