A Preliminary Discourse on the Study of Natural Philosophy

Longman, Rees, Orme, Brown, and Green ... and John Taylor, 1831 - 372 pàgines

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Pàgina 117 - ... single and perfectly definite new circumstance, and manifesting the effect so rapidly that there is not time for any other material change in the pre-existing circumstances. " It is observed that dew is never copiously deposited in situations much screened from the open sky, and not at all in a cloudy night ; but if the clouds...
Pàgina 54 - A clever man, shut up alone and allowed unlimited time, might reason out for himself all the truths of mathematics, by proceeding from those simple notions of space and number of which he cannot divest himself without ceasing to think. But he could never tell, by any effort of reasoning, what would become of a lump of sugar if immersed in water, or what impression would be produced on his eye by mixing the colours yellow and blue.
Pàgina 212 - geology, in the magnitude and sublimity of the objects of which it treats, undoubtedly ranks, in the scale of the sciences, next to astronomy...
Pàgina 169 - Torricelli's views, tended more powerfully than any thing which had previously been done in science to confirm, in the minds of men, that disposition to experimental verification which had scarcely yet taken full and secure root.
Pàgina 13 - What mere assertion will make any man believe, that in one second of time, in one beat of the pendulum of a clock, a ray of light travels over 192,000 miles, and would therefore perform the tour of the world in about the same time that it requires to wink with our eyelids, and in much less than a swift runner occupies in taking a single stride ? What mortal can be made to believe, without demonstration, that the sun is almost a million times larger than the earth ? and that, although so remote from...
Pàgina 7 - The colors which glitter on a soap-bubble are the immediate consequence of a principle the most important from the variety of phenomena it explains, and the most beautiful, from its simplicity and compendious neatness, in the whole science of optics.
Pàgina 41 - The combustion of seven bushels of coal would suffice to raise it to the place where it hangs. The great pyramid of Egypt is composed of granite. It is 700 feet in the side of its base, and 500 in perpendicular height, and stands on eleven acres of ground. Its weight is, therefore, 12,760 millions of pounds, at a medium height of 125 feet ; consequently it would be raised by the effort of about 630 chaldrons of coal — a quantity consumed in some foundries in a week.
Pàgina 60 - When Captain Head was travelling across the Pampas of South America, " his guide one day suddenly stopped him, and, pointing high into the air, cried out ' A lion !' Surprised at such an exclamation, accompanied with such an act, he turned up his eyes, and with difficulty perceived, at an immeasurable height, a flight of condors soaring in circles in a particular spot.
Pàgina 36 - Follow me, and hear a lecture in philosophy ;' and Charles, laying his hand on his sword, to say, ' Follow me, and dethrone the Czar ; ' a man would be ashamed to follow Socrates. Sir, the impression is universal : yet it is strange.
Pàgina 59 - If we plunge our hands, one into ice-cold water, and the other into water as hot as can be borne, and, after letting them stay awhile, suddenly transfer them both to a vessel full of water at blood-heat, the one will feel a sensation of heat, the other of cold. And if we cross the two first fingers of one hand, and place a pea in the fork between them, moving and rolling it about on a table, we shall (especially if we close our eyes) be fully persuaded we have two peas. If the nose be held while...

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