The Pressure of LightSociety for Promoting Christian Knowledge, 1910 - 103 страници |
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Страница 12
... double the actual value we now know it to have . Even this double value is far too minute to be detected by the means then attainable . Their variable results , now an attraction now a repulsion , were due , no doubt , to two actions ...
... double the actual value we now know it to have . Even this double value is far too minute to be detected by the means then attainable . Their variable results , now an attraction now a repulsion , were due , no doubt , to two actions ...
Страница 23
... double that in ( b ) and the pull along FP is double that along DM . Then the work done at Fin ( c ) is double that done at D in ( b ) . But in ( c ) there are twice as many points drawn aside . With twice as many points and double work ...
... double that in ( b ) and the pull along FP is double that along DM . Then the work done at Fin ( c ) is double that done at D in ( b ) . But in ( c ) there are twice as many points drawn aside . With twice as many points and double work ...
Страница 32
... double dose of momentum and the pressure is doubled . Since we have twice as much energy in the space just outside B where reflection is going on , as when we have only the single beam , the pressure is still equal to the energy per ...
... double dose of momentum and the pressure is doubled . Since we have twice as much energy in the space just outside B where reflection is going on , as when we have only the single beam , the pressure is still equal to the energy per ...
Страница 57
... double that due to the light force in a single beam . The effect of the disturb- ing forces was thus eliminated , and the elimination was verified by directing the beam on to different points near the circumference , when nearly the ...
... double that due to the light force in a single beam . The effect of the disturb- ing forces was thus eliminated , and the elimination was verified by directing the beam on to different points near the circumference , when nearly the ...
Страница 93
... double the distance . The cross section of the cone , with vertex at the sun and the square centimetre as base , will at the double distance have four times the area , and four times the matter can thus be balanced . But we confine the ...
... double the distance . The cross section of the cone , with vertex at the sun and the square centimetre as base , will at the double distance have four times the area , and four times the matter can thus be balanced . But we confine the ...
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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.