An Introduction to Natural Philosophy: Designed as a Text-book for the Use of Students in CollegeCollins brother, 1845 - 495 pages |
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angle of incidence applied atmosphere axis axle ball beam body center of gravity colors column common center concave concave lens condensed conductor consequently convex lens cycloid cylinder descend diameter diminished direction distance earth effect elastic electricity electrified electrometer equal equilibrium experiments fall feet fluid focus friction given glass greater Hence horizontal inches inclined plane increased insulated iron length lever Leyden jar light machine magnet mechanical miles mirror motion move Natural Philosophy needle object opposite parallel parallelogram particles passing pendulum perpendicular piston placed plate pole pounds pressure principle produced pulley quantity of matter radius ratio rays reflexion refracting telescopes refraction represented resistance rest screw side sound space described specific gravity spherical aberration square steam string substance supposed surface telescope tion triangle tricity tube velocity vessel vibrations weight wheel
Popular passages
Page 503 - When one medium is a vacuum, n is the ratio of the sine of the angle of incidence to the sine of the angle of refraction. retardation, & — optical path difference between two beams in an interferometer; also known as "optical path difference
Page 339 - ... it is equal to the weight of a column of water whose base is the section of the piston, and whose height is the distance of the level of the water in the barrel AC, above the level in the reservoir.
Page 376 - The first seven letters of the alphabet, A, B, C, D, E, F, G, are...
Page 86 - MECHANICAL POWERS, are six in number ; viz. 1 . The Lever ; 2 The Wheel and Axle ; 3. The Pulley ; 4. The Inclined Plane ; 5 The Screw; 6. The Wedge.
Page 216 - ... that the axle describes a small one, therefore the power is increased in the same proportion as the circumference of the wheel is greater than that of the axle. If the velocity of the wheel is...
Page 234 - ... immense force against the substance destined to receive the impression. Some engines used in coining have flies with arms four feet long, bearing one hundred weight at each of their extremities. By turning such an arm at the rate of one entire circumference in a second, the die will be driven against the metal with the same force as that with which 7500 pounds weight would fall from the height of 16 feet ; an enormous power, if the simplicity and compactness of the machine be considered.
Page 114 - The pulley is a small wheel, movable about its axis by means of a cord, which passes over it. When the axis of a pulley is fixed, the pulley only changes the direction of the power ; if movable pulleys are used, an equilibrium is produced, when the power is to the weight, as one to the number of ropes applied to them.
Page 545 - LIGHT is a change which light undergoes after certain refractions or reflexions, by which a ray acquires POLARITY, or different properties on different sides. This quality of light, which is one of the most remarkable of all its properties, was discovered by Huygens, during his investigations into the cause of double refraction as exhibited in the Iceland crystal ; but the attention of opticians was more particularly directed toward it by the discoveries of Malus, in 1810.* The knowledge of this...
Page 202 - ADB; and the area of a circle is equal to the product of the radius into half the circumference.
Page 140 - For since the time of vibration is to the time of descent through half the length of the pendulum, as the circumference of a circle to its diameter, that is, as 3.14159 to 1?