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Updated: May 29, 2025
At twenty minutes before apparent noon, the sun was seen from the Hecla's main-top, at the height of fifty-one feet above the sea, being the first time that this luminary had been visible to us since the 11th of November, a period of eighty-four days, being twelve days less than the time of its remaining actually beneath the horizon, independently of the effects of atmospherical refraction.
We are assured, therefore, of seeing matter yield itself with docility to our reasonings; but this matter, in all that it has that is intelligible, is our own work; of the reality "in itself" we know nothing and never shall know anything, since we only get its refraction through the forms of our faculty of perceiving.
Just as they reached the crest of the ridge the moon rose from behind, enlarged by the refraction of the atmosphere, and as the attacking column passed along the summit it crossed the moon's disk and disclosed to us below a most interesting panorama, every figure nearly being thrown out in full relief.
Causing the decomposed beam to pass through a second similar prism, but so placed that the colours are refracted back and reblended, the perfectly white luminous disk is restored. In this case, refraction and dispersion are simultaneously abolished. Are they always so? Can we have the one without the other? It was Newton's conclusion that we could not.
Professor Snail adjusted his field-glass and examined the rampart critically. Finally he said: "'The fact that it is not diaphanous convinces me that it is a dense vapor formed by the calorification of ascending moisture dephlogisticated by refraction. A few endiometrical experiments would confirm this, but it is not necessary. The thing is obvious."
Technique is most successful when it is least perceived. Ars celare artem: art reveals life and conceals technique. We must understand something of technique and then forget it in appreciation. When we thrill to the splendor and glory of a sunset we are not thinking of the laws of refraction. Appreciation is not knowledge, but emotion.
"When a beam of light falls upon two refracting surfaces, the partial reflections coincide perfectly in direction; and in this case the interval of retardation taken between the surfaces is to their radius as twice the cosine of the angle of refraction to the radius.
Now let us assume that the ray has come from A to C along AK, KC; the point of refraction K being nearer to A than the point B is; and let CN be the perpendicular upon BC, KN parallel to BC: BM perpendicular upon KN, and KL upon BA.
Poor Poldie was so easily led by any show of nobility anything that looked grand or self-sacrificing! Helen's only knowledge of guilt came from the pale image of it lifted above her horizon by the refraction of her sympathy. She did not know, perhaps never would understand the ghastly horror of conscious guilt, besides which there is no evil else.
The sun never rises on this side of Venus, but it will rise for us because we are approaching it, and the light is the first indication that we are getting near enough to the border between day and night for some of the sun's rays to be bent over the horizon by refraction. But those flames! See how steady they are as a whole, and yet how they change color like a slowly turning prism."
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