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angle angle of incidence applied atmosphere axis axle ball beam body center of gravity colors column common condensed conductor consequently convex convex lens cycloid cylinder descend diameter diminished direction distance earth effect elastic electricity electrified electrometer equal equilibrium experiments fall feet fluid friction fulcrum given glass greater heat Hence horizontal inches inclined plane increased iron length lens less lever Leyden jar light machine magnet mechanical mechanical advantage miles mirror motion move Natural Philosophy needle object opposite parallel parallelogram particles passing pendulum perpendicular pipe piston placed plate pole portion pounds pressure principle produced pulley quicksilver radius ratio rays reflexion refracting telescopes refraction represented resistance rest screw side solid sound space described specific gravity spherical aberration square steam string supposed surface temperature tion triangle tricity tube valve vapor velocity vessel vibrations weight wheel
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 20 - The weight of a body is the force it exerts in consequence of its gravity, and is measured by its mechanical effects, such as bending a spring, or turning a balance. The force thus exerted by a given mass of matter, (as a cubic foot of water,) being taken as the standard, called 1000, and accurately counterpoised in a balance by some substance easily susceptible of division, (as...
Page 86 - We now proceed to consider the effects produced, when these forces are made to act by the intervention of other bodies. These intermediate bodies are called Machines ; and by means of them the effect of a given force may be increased or diminished in any given ratio. Machines are divided into simple and compound.
Page 139 - DB ; hence, (Art. 177,) the time of one vibration will be to the time of a body's falling freely down half the length of the pendulum, as the circumference of a circle to its diameter.
Page 381 - Nothing was ever written upon the subject of electricity, which was more generally read and admired in all parts of Europe than these Letters. There is hardly any European language into which they have not been translated; and, as if this were not sufficient to make them properly known, a translation of them has lately been made into Latin.
Page 133 - O". In order, therefore, to establish the remarkable fact that the velocity with which a liquid spouts from an orifice in a vessel is equal to the velocity which a body would acquire in falling unobstructed from the surface of the liquid to the depth of the orifice, it is only necessary to prove the truth of this principle in any one particular case.
Page 281 - ... weight which is felt when a large stone is lifted from the bed of a river, as soon as it reaches the surface. Large masses of rocks are transported with far greater facility by torrents, on account of their diminished weight. On the same principle, the limbs feel very heavy after lying for some time in a bath.
Page 470 - That in the same plate of steel, of the size of a few square inches only, portions are found varying considerably in their capability of receiving magnetism, though not apparently differing in any other respect.