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

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American Book Company, 1881 - 530 стор.

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Сторінка 163 - Archimedes stated that a body immersed in a fluid is buoyed up by a force equal to the weight of the displaced fluid.
Сторінка 163 - 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.
Сторінка 340 - 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.
Сторінка 339 - 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.
Сторінка 130 - 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.
Сторінка 192 - The pendulum, moved by a single tick, swings through an extremely minute arc, but it returns to the limit of its swing just in time to receive another impulse. By the continuance of this process, the impulses so add themselves together as finally to set the clock a-going.
Сторінка 338 - LAB, is the plane of incidence. The angle that the refracted ray makes with the normal at the point of incidence is called the angle of refraction, and the plane of this angle is the plane of refraction / thus, the angle KA C is an angle of refraction, and the plane of this angle is a plane of refraction.
Сторінка 249 - 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.
Сторінка 23 - Newton's first law of motion, (a) every body continues in its state of rest or of uniform motion, in a straight line...
Сторінка 65 - MACHINES. Mechanical Powers. 449. The elementary machines are seven in number, viz., the cord / the lever / the inclined plane / the pulley ; the wheel and axle; the screw ; and the wedge. These seven are called mechanical powers. The first three are simple elements ; the remaining ones are combinations of these three. The principles of the lever and inclined plane, so far as necessary to an understanding of the principles of Physics, have already been explained in Chapter I.

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