Elements of Physics: Or, Natural Philosophy, General and Medical: Written for Universal Use, in Plain Or Non-technical Language; and Containing New Disquisitions and Practical Suggestions. In Two Volumes, Volume 1

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Isaac Hays
Lea & Blanchard, 1838 - Physics - 240 pages
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Page 356 - Now there is nothing more dangerous to health than to sit near such inlets, as is proved by the rheumatisms, stiff necks, and catarrhs, not to mention more serious diseases, which so frequently follow the exposure. There is an old Spanish proverb, thus translated, " If cold wind reach you through a hole, . Go make your will, and mind your soul.
Page 122 - A man in a boat pulling a rope attached to a large ship, seems only to move the boat : but he really moves the ship a little, for...
Page 306 - ... has not yet been in general use for many years, and the author was one of a numerous crew who probably owed their preservation to its almost miraculous warning. It was in a southern latitude. The sun had just set with placid appearance, closing a beautiful afternoon, and the usual mirth of the evening watch was proceeding, when the captain's order came to prepare with all haste for a storm. The barometer had begun to fall with appalling rapidity. As yet, the oldest sailors...
Page 307 - Such, for a few hours, was the mingled roar of the hurricane above, of the waves around, and of the incessant peals of thunder, that no human voice could be heard, and amidst the general consternation, even the trumpet sounded in vain. In that awful night, but for the little tube of mercury which had given warning, neither the strength of the noble ship, nor the skill and energies of the commander, could have saved one man to tell the tale.
Page 108 - ... other side, and the spring has to begin its work again. The balance-wheel at each vibration allows one tooth of the adjoining wheel to pass, as the pendulum does in a clock ; and the record of the beats is preserved by the wheel which follows.
Page 382 - A boat which moves one mile per hour, displaces or throws aside a certain quantity of water, and with a certain velocity; — if it move twice as fast, it of course displaces twice as many particles in the same time, and requires to be moved by twice the force on that account; but it also displaces every particle with a double velocity, and requires another doubling of the power on this account ; the power then being doubled on two accounts becomes a power of four. In the same manner with a speed...
Page 124 - ... downwards. He was a foolish man who thought he had found the means of commanding always a fair wind for his pleasure-boat, by erecting an immense bellows in the stern. The bellows and sails acted against each other, and there was no motion : indeed, in a perfect calm, there would be a little backward motion, because the sail would not catch all the wind from the bellows. A man...
Page vi - ... them, and the inclemencies of the weather, and the consequences of want and fatigue ; and who to each other were often more dangerous than any wild beasts, unceasingly warring among themselves, and destroying each other with every species of savage, and even cannibal cruelty — countries so occupied formerly, are now become the abodes of myriads of peaceful, civilized, and friendly men, where the desert and impenetrable forest are changed into cultivated fields, rich gardens, and magnificent...
Page 377 - The common cause of waves is the friction of the wind upon the surface of the water. Little ridges or elevations first appear, which by continuance of the force, gradually increase, until they become the rolling mountains seen where the winds sweep over a great extent of water.
Page 88 - While the top is perfectly upright, its point, being directly under its centre, supports it steadily, and although turning so rapidly, has no tendency to move from the place ; but if the top incline at all, the side of the peg, instead of the very point, comes in contact with the floor, and the peg then becomes a little wheel or roller, advancing quickly, and, with its touching edge, describing a curve somewhat as a skaiter does, until it come directly under the body of the top as before.

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