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The maneuver of the occultator brings the balloon out of darkness or plunges it thereinto again, and thus produces the signs necessary for aerial communication. These ingenious arrangements, which depend upon the state of the atmosphere, do not appear to have been imitated outside of the navy. The system of optical communication proposed by Capt.
The truth is, I found a block of four thousand shares on Saturday night, and made a combination with them." "Then the mine is yours?" "The directors will be." "But you were buying shares this morning." "A mere optical illusion, Wilton. I was in fact a seller, for I had shares to spare." "It was a very good imitation." "I don't wonder you were taken in, my boy.
Every book I could get upon optical illusions I had read, and I was astonished to find how many instances are on record of illusions of a much more powerful kind than mine. And yet I could not leave Snowdon. The mountain's very breath grew sweeter and sweeter of Winnie's lips.
On every side, as far as the eyes could reach, wide white plains of undulating ice and snow, broken here and there by patches of barren rock, that seemed now by some optical delusion, against the glaring white, to be of the brightest mauve and violet tints. Only that; ice and snow and rock for mile upon mile, until the tale of three hundred and fifty is told.
Its proper meaning will be disclosed in our next lecture. These experiments and reasonings, if only thoroughly studied and understood, will form a solid groundwork for the analysis of the splendid optical phenomena next to be considered. Action of Crystals on Polarized Light: the Nicol Prism.
You know that optical instruments have acquired great perfection; certain telescopes increase objects six thousand, and bring the moon to within a distance of forty miles. Now at that distance objects sixty feet square are perfectly visible.
Now, a man who saw only a baboon would be quite ready to admit that it was but an optical illusion; but if, instead of a baboon, he had seen an intimate friend, and that friend, by some coincidence of time, had died about that date, he would be a very strong-minded man if he admitted for the mystery of seeing his friend the same natural solution which he would readily admit for seeing a baboon.
I should have let this bit of persiflage go unanswered, assuming it to be one of those witty sallies for which the princes of science are so justly famed and to which they often treat us even when they are not in the presence of works of art, had not the professor followed up his clue with the utmost gravity, assuring me at last that no picture in the gallery was beyond the reach of optical diagnostic.
The thick, moist lower lip is the sensual lip, say the physiognomists, but there are saints with sensual lips and chaste thoughts. Squinty eyes may indicate a shifty character, but more often they indicate conjunctivitis or some defect of the optical apparatus.
The importance which Goethe himself saw in this aspect of the optical problem is shown by the place he gave it in the didactic part of his Farbenlehre.
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