Natural Philosophy, for the Use of Schools and Academies |
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acting angle atmosphere aurora axis ball barometer battery becomes body bulb called carbon cell centre of gravity charged circuit cloud coil colors concave lens condenser conductor connected convex convex lens cylinder decimetres disc discharge distance divergent earth electro-magnet electromotive force electroscope energy equal expansion fall focal length force galvanometer glass Gramme machine grammes greater heat Hence horizontal inches induction instrument intensity latent heat lens lever light liquid luminous machine magnet mass means mercury metallic molecules motion moving needle negative pole object parallel particles passes pendulum pipe piston placed plate portion potential poundals pounds pressure prism produced radiations rarefaction rays reflected refraction relay resistance retina rise rotation shown in Figure side solid sound sound-wave sounder specific gravity spring substance surface temperature terminal stations tion tricity tube units vapor velocity vertical vessel vibrations vulcanite waves wheel wind wire zinc
Popular passages
Page 53 - These simple machines are the lever, the wheel and axle, the pulley, the inclined plane, the wedge, and the screw.
Page 75 - The loss of weight of a body immersed in a fluid is equal to the weight of the displaced fluid, or a body immersed in a fluid is buoyed up by a force equal to the weight of the fluid displaced by it.
Page 107 - ... the pressure of the air on the surface of the water in the basin will force it up into the tumbler and nearly fill it (tig.
Page 110 - We know now that the underlying principle is the same as in a mercurial barometer : it is the pressure of the atmosphere on the surface of the water in the well that pushes the water up into the pump.
Page 180 - Since the specific heat of water is taken as the standard and is one, it may be said that the specific heat of a substance is the amount of heat required to raise or lower the temperature of one pound of the substance one degree Fahrenheit.
Page 215 - Why the image is seen as far behind the mirror as the object is in front of it.— Let AB be an arrow held Fig.
Page 105 - The mercury is sustained in the tube by the pressure of the atmosphere on the surface of the fluid in the cup.
Page 274 - But we must start with a clear conception of an ordinary beam of light. It has been already explained that the vibrations of the individual etherparticles are executed across the line of propagation. In the case of ordinary light we are to figure the etherparticles as vibrating in all directions, or azimuths, as it is sometimes expressed, across this line.
Page 93 - ... is equal to the weight of a column of water whose base is the...
Page 22 - Re-action is always equal and opposite to action, that is to say, the actions of two bodies upon each other are always equal and in opposite directions.