The Pressure of LightSociety for Promoting Christian Knowledge, 1910 - 103 страници |
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John Henry Poynting. CE CE S RE UC - NRLF QC 467 P7 B 4 539 554 OF SCIENCE SERIES THE PRESSURE OF LIGHT ING R.S. 777 U To Pump SCK J. H. POYNTING , Sc.D. , F.R.S. UNIVERSITY OF CALIFORNIA SANTA CRUZ. Front Cover.
John Henry Poynting. CE CE S RE UC - NRLF QC 467 P7 B 4 539 554 OF SCIENCE SERIES THE PRESSURE OF LIGHT ING R.S. 777 U To Pump SCK J. H. POYNTING , Sc.D. , F.R.S. UNIVERSITY OF CALIFORNIA SANTA CRUZ. Front Cover.
Страница 12
... gales of wind . If a flat iron plate is heated and then held in front of a lantern these currents form faint shadows on the screen and may be 1 Note I , p . 83 . It depends entirely on seen rising like smoke . the 12 PRESSURE OF LIGHT.
... gales of wind . If a flat iron plate is heated and then held in front of a lantern these currents form faint shadows on the screen and may be 1 Note I , p . 83 . It depends entirely on seen rising like smoke . the 12 PRESSURE OF LIGHT.
Страница 20
... front . The lines between B and C would have the same direction as those of the magnet with its south pole in front , and so on . N N N 0000 FIG . 6 . Thus we have in these electro - magnetic waves two sets of tubes , electric and ...
... front . The lines between B and C would have the same direction as those of the magnet with its south pole in front , and so on . N N N 0000 FIG . 6 . Thus we have in these electro - magnetic waves two sets of tubes , electric and ...
Страница 29
... front of the wave travels to C the back is just issuing from A ' . The height and depth of the waves will be the same , for they depend only on the temperature of the source , which is the same in the two cases . We must suppose , too ...
... front of the wave travels to C the back is just issuing from A ' . The height and depth of the waves will be the same , for they depend only on the temperature of the source , which is the same in the two cases . We must suppose , too ...
Страница 36
... front face and then on to the back face of the disc , and taking the difference of the two displacements . For the con- vection currents produced would depend on the rise in temperature of the disc , and also on the difference of ...
... front face and then on to the back face of the disc , and taking the difference of the two displacements . For the con- vection currents produced would depend on the rise in temperature of the disc , and also on the difference of ...
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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.