The Pressure of LightSociety for Promoting Christian Knowledge, 1910 - 103 страници |
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Страница 7
... CORPUSCULAR THEORY 83 II THE PRESSURE DUE ΤΟ WAVES ISSUING 84 NORMALLY FROM A SURFACE III THE PRESSURE OF A BEAM INCIDENT NORMALLY ON A PERFECTLY REFLECTING SURFACE 85 NOTE IV V THE LIGHT FORCE AT A REFRACTING PAGE vii.
... CORPUSCULAR THEORY 83 II THE PRESSURE DUE ΤΟ WAVES ISSUING 84 NORMALLY FROM A SURFACE III THE PRESSURE OF A BEAM INCIDENT NORMALLY ON A PERFECTLY REFLECTING SURFACE 85 NOTE IV V THE LIGHT FORCE AT A REFRACTING PAGE vii.
Страница 8
... SUNLIGHT 92 VII THE RESISTING FORCE ON A SPHERE MOVING ROUND THE SUN AND RADIATING R PER SQ . CM . PER SECOND , AND THE REDUCTION OF ITS ORBIT ROUND THE SUN • 95 PRESSURE OF LIGHT I HOW LIGHT EXERTS PRESSURE WHEN we viii CONTENTS.
... SUNLIGHT 92 VII THE RESISTING FORCE ON A SPHERE MOVING ROUND THE SUN AND RADIATING R PER SQ . CM . PER SECOND , AND THE REDUCTION OF ITS ORBIT ROUND THE SUN • 95 PRESSURE OF LIGHT I HOW LIGHT EXERTS PRESSURE WHEN we viii CONTENTS.
Страница 17
... force , " or " tubes of force , " as in fig . 4 , start from the negative on the wax to the positive on the conductor , and that these tubes of force are trying to contract and pull the bodies together . The action is like that which ...
... force , " or " tubes of force , " as in fig . 4 , start from the negative on the wax to the positive on the conductor , and that these tubes of force are trying to contract and pull the bodies together . The action is like that which ...
Страница 18
... force tends to A B P S R FIG . 5 . draw together lengthways and to bulge out sideways , and so we have side pressure of the tubes of mag- netic force against each other just as we have it with tubes of electric force , though probably ...
... force tends to A B P S R FIG . 5 . draw together lengthways and to bulge out sideways , and so we have side pressure of the tubes of mag- netic force against each other just as we have it with tubes of electric force , though probably ...
Страница 19
... force is being propa- gated on from point to point in their course . But to propagate a condition we must have motion in the machinery which propagates it . This motion of the machinery is supplied by the spinning round the magnetic ...
... force is being propa- gated on from point to point in their course . But to propagate a condition we must have motion in the machinery which propagates it . This motion of the machinery is supplied by the spinning round the magnetic ...
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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.