Wells's Natural Philosophy: For the Use of Schools, Academies, and Private Students : Introducing the Latest Results of Scientific Discovery and Research : Arranged with Special Reference to the Practical Application of Physical Science to the Arts and the Experiences of Every Day Life : with Upward of Three Hundred Engravings

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Ivison & Phinney, 1857 - 452 Seiten
 

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Seite 125 - 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 84 - The disciples of Plato contributed not a little to the advancement of optics, by the important discovery they made, that light emits itself in straight lines, and that the angle of incidence is always equal to the angle of reflection. Plato terms colours " the effect of light transmitted from bodies, the small particles of which were adapted to the organ of sight.
Seite 256 - ... said to amount to 3° or 4° only ; while upon land the difference often amounts to 9° or 10°. In temperate regions, and particularly in latitudes extending from 25° to...
Seite 105 - An oar is a lever of the second kind. The reaction of the water against the blade is the fulcrum. The boat is the weight, and the hand of the boatman the power. The rudder of a ship or boat is an example of this kind of lever, and explained in a similar way.
Seite 71 - ... 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 53 - ... position. If now we add a few drops of strong salt and water, we shall see, as it sinks and mixes with the water, that the ball, a, is forced to the top of the fluid, because the attraction of gravitation on the denser fluid draws it down, and compels it to occupy the place of a. The principle that the particles of liquids arrange themselves according to their specific gravities, has been taken advantage of in the West Indies by the slaves, in order to enable them to steal rum from casks. The...
Seite 109 - Any arrangement of machinery, therefore, which will enable us to render power more available, by applying it in the most advantageous direction, is as convenient and valuable as one which enables a small power to balance or overcome a © What are familiar applications of filed pulleys? Fio. 82. great weight. Thus, if we wish to apply the strength of a horse to lift...
Seite 204 - No eider-down In the cradle of an infant is tucked in more kindly than the sleeping-dress of winter about the feeble flower-life of the Arctic regions.
Seite 16 - There are living creatures so minute, that a hundred millions of them may be comprehended in the space of a cubic inch. But these creatures, until they are lost to the sense of sight, aided by the most powerful instruments, are seen to possess organs fitted for collecting their food, and even capturing their prey. They are, therefore supplied with organs, and these organs consist of tissues nourished by circulating fluids, which must consist of parts or atoms, if we please so to term them.
Seite 179 - Those in the rear are, in each step, a little later than those before them. This produces a sort of undulation in the whole column, which is difficult to describe, but which all who have noticed it will understand. Each rank steps, not when the sound is made, but when, in its progress down the column, at the rate of 1125 feet per second, it reaches their ears. Those who are near the music hear it as...

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