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Updated: June 18, 2025
Huyghens and Newton had made considerable progress in optics; Newton had approximately calculated the rate of transmission of sound; and the continental mathematicians had succeeded in determining some of the laws of sonorous vibrations. Magnetism and electricity had been considerably advanced by Gilbert. Chemistry had got as far as the mutual neutralisation of acids and alkalies.
She could be critic of him, for an induction to the loving of him more justly: yet if he had an excessive desire to win the esteem of people, as these keen young optics perceived in him, he strove to deserve it; and no one could accuse him of laying stress on the benefits he conferred. Designedly, frigidly to wound a man so benevolent, appeared to her as an incomprehensible baseness.
Neither with waxen optics nor with subservient jointings did she go through her pathways of the world.
Then they discussed optics, as they called it, and whether a certain injury to the brain would produce blindness or not, but they could not agree about it, and said they must test it by experiment by and by; and next they discussed plants, and that interested me, because in the summer Sadie and I had planted seeds I helped her dig the holes, you know and after days and days a little shrub or a flower came up there, and it was a wonder how that could happen; but it did, and I wished I could talk I would have told those people about it and shown then how much I knew, and been all alive with the subject; but I didn't care for the optics; it was dull, and when they came back to it again it bored me, and I went to sleep.
From the town of Ghat to the base of this range is half a day, eastward, although the range looks, by the ordinary delusion of Desert optics, to be close upon the town. These were evidently Ouweek's spies. They certainly did not accost me in that frank manner as the Touaricks had been wont in Ghadames. "Without my permission," or literally "tearing the Litham from my face."
I am going to put the head on to the Berenice; my apprentice must long since have completed his preparations; but the rascal came into the world with two left-hands, and as he squints with one eye everything that is straight looks crooked to him, and according to the law of optics the oblique looks straight.
But the principle is the same it's all a question of optics. Wait! A mirror is placed thus, another mirror behind it, the image is reflected I say, it is purely a problem in physics." Taking down from the walls several mirrors, he arranged them, turned them round and round, but, not getting the desired result, concluded: "As I say, it's nothing more or less than a question of optics."
Several eminent men flourished in the Netherlands. But the glory of others, in countries presenting a wider theatre for their renown, in many instances eclipsed them; and the inventors of new methods and systems in anatomy, optics and music were almost forgotten in the splendid improvements of their followers. He was at once eminent as jurist, poet, theologian, and historian.
We might demonstrate in detail how, in Science, an advance of one division presently advances other divisions how Astronomy has been immensely forwarded by discoveries in Optics, while other optical discoveries have initiated Microscopic Anatomy, and greatly aided the growth of Physiology how Chemistry has indirectly increased our knowledge of Electricity, Magnetism, Biology, Geology how Electricity has reacted on Chemistry and Magnetism, developed our views of Light and Heat, and disclosed sundry laws of nervous action.
He thus came near to anticipating Newton. Before leaving the subject of Kepler's optics it will be well to recall that a few years later after hearing of Galileo's telescope, Kepler suggested that for astronomical purposes two convex lenses should be used, so that there should be a real image where measuring wires could be placed for reference.
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