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Page 156 - ... the angle of reflection is always equal to the angle of incidence, the image for any point can be seen only in the reflected ray prolonged.
Page 23 - In the visible, mechanical world no two bodies can occupy the same place at the same time, but apparently in chemistry they can and do.
Page 25 - A pendulum by falling gains a quantity of motion sufficient to carry it, on the other side, to the same height as that from which it fell; and were it not for the resistance of the air and the impediments, a pendulum when once set in motion would continue to vibrate by its own inertia, (Art.
Page 52 - In the first class the fulcrum is between the power and the weight ; in the second class, the fulcrum is...
Page 51 - ... plane is moved under the weight. The wedge is used when great force is to be exerted in a small space, such, for example, as in splitting wood or stone, or in pressing oils or juices from seeds. The edges of such cutting-tools as scissors, knives, chisels, hatchets, and razors are forms of wedges. 56. The Screw. — The screw is another modification of the inclined plane, and is employed as a mechanical power whenever a great force is to be exerted in a small space. The copying-press, Fig. 17,...
Page 102 - To explain the construction of the common barometer, and to shew that the mercury is sustained in it by the pressure of the air on the surface of the mercury in the basin.
Page 92 - Pierce three small holes in the side of an empty tomato-can, one near the top, one in the middle, and one near the bottom.
Page 195 - The axis of the heavens is the axis of the earth, produced both ways to the celestial concave. That extremity of it which is towards the north pole of the earth is called the north pole of the heavens : the other is called the south pole. Thus in the figure Art. 84, PP' is the axis of the heavens, P and P
Page 202 - ... loss of weight of the ball with the weight of the water displaced. • A body floats when it sinks into a liquid to such a point that the weight of the liquid displaced by the body is equal to the weight of the body. If the body can not displace enough water to equal its own weight it sinks, but it loses as much weight as the weight of the water it displaces. A ship weighing 50,000 tons must push aside 50,000 tons of water. A cubic foot of water weighs about 62J pounds. If a body displaces a...