Introductory Course of Natural Philosophy for the Use of Schools and AcademiesA. S. Barnes, 1875 - 504 pages |
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acid action acts air-pump apparatus application atmosphere attraction axis balloon barometer battery boiler called causes centre of gravity color compressed condensed conductor consists convex lens copper cord cylinder density Describe direction distance earth effect elastic force electricity electrified electrometer equal equilibrium example expansion experiment Explain flow fluid friction fulcrum galvanometer gases glass heat Hence Illustrate inch inclined plane instrument insulated iron lens lenses Leyden jar light liquid machine magnet Manometer mercury metal method molecules motion needle negative object oscillations particles passes pendulum phenomena piece pipe piston pith ball placed plate poles POPULAR PHYSICS porosity position pressure principle pulley quantity rays reflected reflector refraction resistance shown in Fig solid sound specific gravity steam substances surface telescope temperature tension thermometer tion transmitted tricity tube valve vapor velocity velocity of sound vessel vibrations voltaic pile weight wheel whilst wire zinc
Popular passages
Page 66 - Archimedes stated that a body immersed in a fluid is buoyed up by a force equal to the weight of the displaced fluid.
Page 65 - A body immersed in a liquid is buoyed up by a force equal to the weight of the liquid displaced by it.
Page 18 - Newton generalized the law of attraction into a statement that every particle of matter in the universe attracts every other particle with a force which varies directly as the product of their masses and inversely as the square of the distance between them; and he thence deduced the law of attraction for spherical shells of constant density.
Page 125 - The heat which is expended in changing a body from the solid to the liquid state, or from the liquid to the gaseous state, is called latent heat.
Page 80 - Sounds arc propagated better in calm than in stormy weather, also with more intensity in the direction of the wind than in the contrary direction. A modification of the law, that the intensity of sound varies inversely as the square of the distance, takes place when sound is caused to travel through long smooth tubes. The sound moves like the rings produced in a pool of water by a falling stone: they...
Page 104 - ... air and the smallness of the tube. The bulb is therefore heated, when the air within expands, and a portion escapes in bubbles through the mercury. On cooling, the pressure of the external atmosphere forces a quantity of mercury through the tube into the bulb. By repeating this operation a few times, the bulb and a portion of the tube are filled with mercury. The whole is then heated till the mercury boils, thus filling the tube, when the funnel is melted off and the tube hermetically sealed...
Page 161 - When the object is between the principal focus and the mirror, the image is virtual and erect, as shown in Fig.
Page 161 - We shall consider the case in which the reflecting surface is a segment of a sphere. The following definitions apply equally to concave and convex mirrors: The middle point of the mirror is called its vertex. The centre of the sphere, of which the mirror forms a part, is called the optical centre.
Page 53 - In order to repeat TORRICELLI'S experiment, take a glass tube about three feet in length, closed at one end and open at the other. Turning the closed end downwards, let it be filled with mercury. Then holding the finger over the open end, let it be inverted in a vessel of mercury, as shown in Fig.
Page 25 - ... fluid above it. In consequence of the principle of PASCAL, this pressure is transmitted laterally, and acts against the sides of the vessel with an equal intensity. Hence, every part of the surface is pressed with a force equal to the weight of a column of liquid whose base is the surface pressed, and whose height is equal to the distance from that surface to the upper level of the fluid. The same principle holds, whatever may be the form of the vessel. Why so called? How illustrated? (71.) What...