Introductory Course of Natural Philosophy for the Use of High Schools and Academies

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American Book Company, 1888 - Physics - 530 pages

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Page 158 - A body immersed in a liquid is buoyed up by a force equal to the weight of the liquid displaced by it.
Page 159 - Archimedes stated that a body immersed in a fluid is buoyed up by a force equal to the weight of the displaced fluid.
Page 23 - Every body continues in a state of rest, or of uniform motion in a straight line, unless it is compelled to change that state by a force impressed upon it.
Page 214 - ... 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 41 - The CENTRE OF GRAVITY of a body is. that point through which the direction of its weight always passes.
Page 522 - A brief course of experiments in chemistry, covering about forty weeks' work in the laboratory. COOLEY'S LABORATORY STUDIES IN CHEMISTRY. By LEROY C. COOLEY.
Page 159 - The BAROSCOPE consists of a beam like that of a balance, from one extremity of which is suspended a hollow sphere of copper, and from the other extremity a solid sphere of lead. These are made to balance each other in the atmosphere. If the instrument be placed under the receiver of an air-pump and the air exhausted, the copper sphere will descend.
Page 334 - When a ray of light passes from one medium to another, it is refracted so that the ratio of the sine of the angle of incidence to the sine of the angle of refraction is equal to the ratio of the velocities in the two media.
Page 333 - It may also be defined as the sine of the angle of incidence divided by the sine of the angle of refraction, as light passes from air into the substance.
Page 126 - 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. 75. On removing the finger, the mercury sinks in the tube until the column.

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