The Pressure of LightSociety for Promoting Christian Knowledge, 1910 - 103 страници |
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Страница 13
... action of the air currents on a disc heated by a beam of light may easily be many times greater than the pressure of ... Radiometer . radiometer in its commonest form consists of four small mica discs fixed at the four ends of a hori ...
... action of the air currents on a disc heated by a beam of light may easily be many times greater than the pressure of ... Radiometer . radiometer in its commonest form consists of four small mica discs fixed at the four ends of a hori ...
Страница 14
... radio- meter is due to the residual air still remaining in what we call the vacuum in the bulb . The black- ened ... radiometer action , " as it is termed , only comes into serious consideration when the air is very much rarefied ...
... radio- meter is due to the residual air still remaining in what we call the vacuum in the bulb . The black- ened ... radiometer action , " as it is termed , only comes into serious consideration when the air is very much rarefied ...
Страница 15
... radiometer action disturbs them when we work in a vacuum . We shall see later how it is possible to steer between Scylla and Charybdis and reveal the true pressure due to light . It is just a hundred years since Thomas Young killed the ...
... radiometer action disturbs them when we work in a vacuum . We shall see later how it is possible to steer between Scylla and Charybdis and reveal the true pressure due to light . It is just a hundred years since Thomas Young killed the ...
Страница 36
... action would , therefore , be due practically to the rise in temperature of the disc , and would be the same in ... radiometer action depends on the small difference of temperature of the two sides of the disc . This difference is ...
... action would , therefore , be due practically to the rise in temperature of the disc , and would be the same in ... radiometer action depends on the small difference of temperature of the two sides of the disc . This difference is ...
Страница 37
... radiometer action . In this way , by obser- vations with the same beam , first on the thicker , and then on the thinner black disc , the radiometer action was eliminated . On the bright discs the radiometer action was too small to be ...
... radiometer action . In this way , by obser- vations with the same beam , first on the thicker , and then on the thinner black disc , the radiometer action was eliminated . On the bright discs the radiometer action was too small to be ...
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angle beam of light black disc black surface blackened calculated circular cloth boards comets convection corpuscles corpuscular theory cubic centimetre deflexion density diameter direction Doppler dynes earth earth's distance effect electric electrified plate emitted energy per cubic ergs exerted experiment Fcap fluorite forward front face give glass gravitation constant gravitative pull greater heat hemisphere incident beam Lebedew light force light-pressure limp cloth magnetic measured medium millionth motion Nernst lamp normal NORTHUMBERLAND AVENUE Note observed torque orbit particles perpendicular Post 8vo PRESSURE OF LIGHT Professor push quartz fibre radiation radiometer action radius refracting repelled repulsion rise in temperature round the sun says shown in fig side sideways solar Solar Constant spinning square centimetre sunlight suppose suspended system tail telescope tion tubes of force UNIVERSITY OF BIRMINGHAM University of Cambridge vacuum velocity of light wave-length waves αρ
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Страница 34 - A flat body exposed to sunlight would experience this pressure on its illuminated side only, and would therefore be repelled from the side on which the light falls. It is probable that a much greater energy of radiation might be obtained by means of the concentrated rays of the electric lamp. Such rays falling on a thin metallic disk, delicately suspended in a vacuum, might perhaps produce an observable mechanical effect.
Страница 82 - The Sun cannot tolerate dust. With the pressure of his light he drives the finest particles altogether away from his system. With his heat he warms the larger particles. They give out this heat again and with it some of that energy which enables them to withstand his attraction. Slowly he draws them to himself and at last they unite with him and end their separate existence.