The Pressure of LightSociety for Promoting Christian Knowledge, 1910 - 103 страници |
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Страница 39
... circular microscope cover glasses , CD ( fig . 15 ) , each 12.8 mm . in diameter , and o'17 mm . thick , were hung up in a partially exhausted glass vessel by a quartz fibre . They were sil- vered on the front side and brilliantly ...
... circular microscope cover glasses , CD ( fig . 15 ) , each 12.8 mm . in diameter , and o'17 mm . thick , were hung up in a partially exhausted glass vessel by a quartz fibre . They were sil- vered on the front side and brilliantly ...
Страница 47
... , and with that disc the radiometer action was the greatest . It tended to press the disc back from the source . Each disc was made of two thin circular plates О С FIG . 18 . of glass 12 cm EXPERIMENTS ON PRESSURE OF LIGHT 47.
... , and with that disc the radiometer action was the greatest . It tended to press the disc back from the source . Each disc was made of two thin circular plates О С FIG . 18 . of glass 12 cm EXPERIMENTS ON PRESSURE OF LIGHT 47.
Страница 62
... in the direction of the circular arrow , but as the fibre was rather coarse the deflexion was very minute . To render the effect more evident the beam was only sent in intermittently . The system was made to 62 PRESSURE OF LIGHT.
... in the direction of the circular arrow , but as the fibre was rather coarse the deflexion was very minute . To render the effect more evident the beam was only sent in intermittently . The system was made to 62 PRESSURE OF LIGHT.
Страница 76
... circular orbit which we have supposed . If the orbit is elliptical , another effect of light- pressure comes in , which we may term the " Doppler Reception Effect . " Let fig . 33 represent the orbit . As a particle is moving through P ...
... circular orbit which we have supposed . If the orbit is elliptical , another effect of light- pressure comes in , which we may term the " Doppler Reception Effect . " Let fig . 33 represent the orbit . As a particle is moving through P ...
Страница 77
... circular orbit . We may regard these forces , due to excess and defect of P Q A FIG . 33 . momentum received , as extra forces superposed on the inverse square force . At such a point as P the extra force is along SP and is a resistance ...
... circular orbit . We may regard these forces , due to excess and defect of P Q A FIG . 33 . momentum received , as extra forces superposed on the inverse square force . At such a point as P the extra force is along SP and is a resistance ...
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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.