The Pressure of LightSociety for Promoting Christian Knowledge, 1910 - 103 страници |
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Страница 9
... bodies , and only to be detected by exceedingly sensitive apparatus . In the following pages I shall try to give some account of the reasoning by which the existence of light - pressure was predicted , and shall then describe the ...
... bodies , and only to be detected by exceedingly sensitive apparatus . In the following pages I shall try to give some account of the reasoning by which the existence of light - pressure was predicted , and shall then describe the ...
Страница 10
... bodies , darting out at enormous speed from every glowing surface . Each molecule or atom of the surface was supposed to be a little battery of guns , keeping up a continuous fire of shot , each shot immensely smaller than the atom ...
... bodies , darting out at enormous speed from every glowing surface . Each molecule or atom of the surface was supposed to be a little battery of guns , keeping up a continuous fire of shot , each shot immensely smaller than the atom ...
Страница 17
... bodies together . The action is like that which would occur if every tube of force were a stretched india - rubber cord with its ends fastened on the two surfaces . Imagine , then , a bundle of such stretched rubber cords . As they ...
... bodies together . The action is like that which would occur if every tube of force were a stretched india - rubber cord with its ends fastened on the two surfaces . Imagine , then , a bundle of such stretched rubber cords . As they ...
Страница 69
... bodies in our system . For instance , the whole pressure of the sunlight falling on the Earth , if it were entirely absorbed , would amount only to about 74,000 tons weight.1 This appears a big I use here and elsewhere the energy of ...
... bodies in our system . For instance , the whole pressure of the sunlight falling on the Earth , if it were entirely absorbed , would amount only to about 74,000 tons weight.1 This appears a big I use here and elsewhere the energy of ...
Страница 75
... bodies , large compared with the particles which are repelled and yet minute compared with the planets , a class of bodies which reveal their abundant presence in the solar system when they enter our atmosphere and perish as shooting ...
... bodies , large compared with the particles which are repelled and yet minute compared with the planets , a class of bodies which reveal their abundant presence in the solar system when they enter our atmosphere and perish as shooting ...
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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.