The Pressure of LightSociety for Promoting Christian Knowledge, 1910 - 103 страници |
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Страница 8
... SPHERE COMPARED WITH THE GRAVITATION PULL 90 VI THE AMOUNT OF MATTER WHICH CAN BE PUSHED OUT BY THE PRESSURE OF SUNLIGHT 92 VII THE RESISTING FORCE ON A SPHERE MOVING ROUND THE SUN AND RADIATING R PER SQ . CM . PER SECOND , AND THE ...
... SPHERE COMPARED WITH THE GRAVITATION PULL 90 VI THE AMOUNT OF MATTER WHICH CAN BE PUSHED OUT BY THE PRESSURE OF SUNLIGHT 92 VII THE RESISTING FORCE ON A SPHERE MOVING ROUND THE SUN AND RADIATING R PER SQ . CM . PER SECOND , AND THE ...
Страница 70
... spheres , each with 8888 FIG . 32 . о half the radius of the actual earth . There would be eight such spheres . If these eight spheres were set facing the sun , as in fig . 32 , they would ex- perience in all the same total gravitative ...
... spheres , each with 8888 FIG . 32 . о half the radius of the actual earth . There would be eight such spheres . If these eight spheres were set facing the sun , as in fig . 32 , they would ex- perience in all the same total gravitative ...
Страница 71
... sphere had the same mean density as the earth , viz . 5'5 , the equality would hold for each sphere separately . The radius of each would then be about 13.5 millionths of a centimetre . If the radius were still further reduced ...
... sphere had the same mean density as the earth , viz . 5'5 , the equality would hold for each sphere separately . The radius of each would then be about 13.5 millionths of a centimetre . If the radius were still further reduced ...
Страница 72
John Henry Poynting. repelled from the sun . Smaller spheres would be repelled , and finally would be driven away alto- gether . If they reflected back some of the light , the repulsion would be thereby increased , and a drop of water of ...
John Henry Poynting. repelled from the sun . Smaller spheres would be repelled , and finally would be driven away alto- gether . If they reflected back some of the light , the repulsion would be thereby increased , and a drop of water of ...
Страница 80
... sphere of the density of the earth , black so that it absorbs all the sun's radiation falling on it , and 1 cm . radius , say the the size of a marble , will fall in towards the sun , if at the earth's distance from it , about 820 ...
... sphere of the density of the earth , black so that it absorbs all the sun's radiation falling on it , and 1 cm . radius , say the the size of a marble , will fall in towards the sun , if at the earth's distance from it , about 820 ...
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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.