The Principles of Physics |
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Common terms and phrases
acceleration angle atmosphere atmospheric pressure axis ball barometer body boiling called center of mass centimeters centroid colors component concave condensation convex lens cubic cubic centimeter density direction distance dynes earth elastic electricity equal equilibrium ether ether waves exerted fall flame fluid foot-pounds force acting fork gases given glass gram greater hence instrument kilogram kinetic energy lens light waves liquid machine mass matter measure medium mercury meters mirror molecules momentum move object octave particle pass pendulum pipe piston pitch placed plane plate position pressure produced QUESTIONS AND PROBLEMS radiation raised rarefaction ratio rays reflected refraction represent resistance resultant rise rotation scale SECTION sound waves specific gravity specific heat spectrum speed steam straight line string substances surface temperature thermometer tion tone tube unit vapor velocity vertical vessel volume wave length weight wire
Popular passages
Page 500 - We want a small range of rapid vibrations, and we know no better than to make the whole series leading up to them. It is as though, in order to sound some little shrill octave of pipes in an organ, we were obliged to depress every key and every pedal, and to blow a young hurricane.
Page 258 - The total energy of any body or system of bodies is a quantity which can neither be increased nor diminished by any mutual action of such bodies, though it may be transformed into any one of the forms of which energy is susceptible.
Page 500 - ... radiation consists of waves of all sizes, it is true ; but then solar radiation has innumerable things to do besides making things visible. The whole of its energy is useful. In artificial lighting nothing but light is desired ; when heat is wanted it is best obtained separately, by combustion. And so soon as we clearly recognize that light is an electrical vibration, so soon shall we begin to beat about for some mode of exciting and maintaining an electrical vibration of any required degree...
Page 506 - The bath used is a solution of a salt of the metal to be deposited. The cyanides of gold and silver are generally used for gilding and silvering.
Page 133 - But it indirectly feels the pressure of the air on the surface of the water in the open vessel, and it is this pressure that sustains the water in the jar.
Page 516 - To whatever results investigations of this kind may lead, their chief interest lies for the present in the possibilities they offer for the production of an efficient illuminating device. In no branch of electric industry is an advance more desired than in the manufacture of light. Every thinker, when considering the barbarous methods employed, the deplorable losses incurred in our best systems of light production, must have asked himself, What is likely to be the light of the future...
Page 55 - Newton's three laws: a body at rest remains at rest, and a body in motion remains in uniform motion in a straight line unless acted upon by an external force...
Page 463 - The idea that magnetism was nothing more nor less than a whirl of electricity is no new one — it is as old as Ampere. Perceiving that a magnet could be imitated by an electric whirl, he made the hypothesis that an electric whirl existed in every magnet and was the cause of its properties. Not of course that a steel magnet contains an electric current circulating round and round it, as an electro-magnet has : nothing is more certain than the fact that a magnet is not magnetized as a whole, but that...
Page 306 - See f/stop. focal length When the lens is focused on infinity, it is the distance from the optical center of the lens to the focal plane. focal plane The plane on which a lens forms a sharp image. Also, it may be the film plane or sensor plane.