"The Thousand and Second Tale of Scheherazade" - читать интересную книгу автора (Poe Edgar Allan)when it came. Another took two loud sounds and out of them made a
silence. Another constructed a deep darkness out of two brilliant lights.*(4) Another made ice in a red-hot furnace.*(5) Another directed the sun to paint his portrait, and the sun did.*(6) Another took this luminary with the moon and the planets, and having first weighed them with scrupulous accuracy, probed into their depths and found out the solidity of the substance of which they were made. But the whole nation is, indeed, of so surprising a necromantic ability, that not even their infants, nor their commonest cats and dogs have any difficulty in seeing objects that do not exist at all, or that for twenty millions of years before the birth of the nation itself had been blotted out from the face of creation."'*(7) * Voltaic pile. *(2) The Electro Telegraph Printing Apparatus. *(3) The Electro telegraph transmits intelligence instantaneously- at least at so far as regards any distance upon the earth. *(4) Common experiments in Natural Philosophy. If two red rays from two luminous points be admitted into a dark chamber so as to fall on a white surface, and differ in their length by 0.0000258 of an inch, their intensity is doubled. So also if the difference in length be any whole-number multiple of that fraction. A multiple by 2 1/4, 3 1/4, &c., gives an intensity equal to one ray only; but a multiple by 2 1/2, 3 1/2, &c., gives the result of total darkness. In violet rays similar effects arise when the difference in length same- the difference varying with a uniform increase from the violet to the red. Analogous experiments in respect to sound produce analogous results. *(5) Place a platina crucible over a spirit lamp, and keep it a red heat; pour in some sulphuric acid, which, though the most volatile of bodies at a common temperature, will be found to become completely fixed in a hot crucible, and not a drop evaporates- being surrounded by an atmosphere of its own, it does not, in fact, touch the sides. A few drops of water are now introduced, when the acid, immediately coming in contact with the heated sides of the crucible, flies off in sulphurous acid vapor, and so rapid is its progress, that the caloric of the water passes off with it, which falls a lump of ice to the bottom; by taking advantage of the moment before it is allowed to remelt, it may be turned out a lump of ice from a red-hot vessel. *(6) The Daguerreotype. *(7) Although light travels 167,000 miles in a second, the distance of 61 Cygni (the only star whose distance is ascertained) is so inconceivably great, that its rays would require more than ten years to reach the earth. For stars beyond this, 20- or even 1000 years- would be a moderate estimate. Thus, if they had been annihilated 20, or 1000 years ago, we might still see them to-day by the light which started from their surfaces 20 or 1000 years in the past time. That many which we see daily are really extinct, is not |
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