Well's Natural Philosophy

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Ivison & Phinney, 1858 - 452 Seiten
 

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Seite 123 - All the rivers run into the sea; yet the sea is not full; unto the place from whence the rivers come, thither they return again.
Seite 200 - A degree of deafness ensues when this tube is obstructed, as in a cold ; and a crack, or sudden noise, with immediate return of natural hearing, is generally experienced when, in the effort of sneezing or otherwise, the obstruction is removed.
Seite 59 - ... side carries it just as far past on the 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.
Seite 165 - Air, as well as all other gases and vapors, possesses weight. The weight of air may be shown by first weighing a suitable vessel filled with air; then exhausting the air from it by means of an air-pump, and weighing again. The difference between the two weights will be the weight of the air contained in the vessel. The weight of 100 cubic inches of air is about 31 grains. TO what...
Seite 46 - ... of gravity. If the two bodies be of equal weight, the centre of gravity will be in the middle of the line which unites them. But if one be heavier than the other, the centre of gravity will be as much nearer to the heavier one as the heavier exceeds the light one in weight.
Seite 252 - ... dispensed with, and the steam, after it has moved the piston from one end of the cylinder to the other, is allowed to escape, by the opening of a valve, directly into the air. To accomplish this, it is evident that the steam must have an elastic force greater than the pressure of the atmosphere, or it could not expand and drive out the waste steam on the other side of the piston, in opposition to the pressure of tho air. An engine of this character is accordingly termed a "high-pressure
Seite 35 - Pendulum is a body suspended by a right line from any point, and moving freely about that point as a center. The point about which the pendulum revolves, is called the center of suspension. The vibration of a pendulum, is its motion from a state of rest at the highest point on one side, to the highest point on the other side.* The center of oscillation of a pendulum, is such a point, that, were all the matter of the pendulum collected in it, the quantity of motion (or momentum) would be equal to...
Seite 119 - Whatever rude structure the climate and materials of any country have obliged its early inhabitants to adopt for their temporary shelter, the same structure, with all its prominent features, has been afterwards kept up by their refined, and opulent posterity. Thus, the Egyptian style of building...
Seite 301 - HOT a™ the im- ^ke images formed in a common looking-glass are maim7 produced by the reflection of the rays of light from the metallic surface attached to the back of the glass, and not from the glass itself. The effect may be explained as follows: — A portion of the light incident upon the anterior surface is regularly reflected, and another portion irregularly. The first produces a very faint image of an object placed before the glass, while the other renders the surface of the glass itself...
Seite 329 - If the objects of the material world had been illuminated with white light, all the particles of which possessed the same degree of refrangibility, and were equally acted upon by the bodies on which they fall, all nature would have...

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