The Pressure of LightSociety for Promoting Christian Knowledge, 1910 - 103 страници |
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Страница 17
... 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 would occur if every ...
... 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 would occur if every ...
Страница 18
... tubes of mag- netic force against each other just as we have it with tubes of electric force , though probably it is now produced in a different way . Now let us see what electric and magnetic con- ditions we must imagine in a train of ...
... tubes of mag- netic force against each other just as we have it with tubes of electric force , though probably it is now produced in a different way . Now let us see what electric and magnetic con- ditions we must imagine in a train of ...
Страница 20
... tubes , electric and magnetic respect- ively , at right angles to each other and to the line of propagation . Both kinds of tube tend to bulge as it were sideways , tend to press against each other , and tend to press against any ...
... tubes , electric and magnetic respect- ively , at right angles to each other and to the line of propagation . Both kinds of tube tend to bulge as it were sideways , tend to press against each other , and tend to press against any ...
Страница 21
... tubes of electric force and tubes of magnetic force , which are rushing sideways along the beam and pressing sideways against each other and against any surface which the beam strikes . But though we all now believe in the electro ...
... tubes of electric force and tubes of magnetic force , which are rushing sideways along the beam and pressing sideways against each other and against any surface which the beam strikes . But though we all now believe in the electro ...
Страница 27
... tube several feet long . The experimenter blows through the open end and whirls the tube in a horizontal circle round his head , the pitch - pipe moving round the circumference of the circle . A hearer outside the circle notes a rise in ...
... tube several feet long . The experimenter blows through the open end and whirls the tube in a horizontal circle round his head , the pitch - pipe moving round the circumference of the circle . A hearer outside the circle notes a rise in ...
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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.