The Pressure of LightSociety for Promoting Christian Knowledge, 1910 - 103 страници |
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Страница 12
... obtained conclusive , or even consistent results . If these early experimenters had known the Principle of the Conservation of Energy , they would have been able to calculate the value of the pressure , which they were looking for , and ...
... obtained conclusive , or even consistent results . If these early experimenters had known the Principle of the Conservation of Energy , they would have been able to calculate the value of the pressure , which they were looking for , and ...
Страница 34
... obtained by means of the concentrated rays of the electric lamp . Such rays falling on a thin metallic disc , delicately suspended in a vacuum , might perhaps produce an observable mechanical effect . " 1 Twenty - seven years later ...
... obtained by means of the concentrated rays of the electric lamp . Such rays falling on a thin metallic disc , delicately suspended in a vacuum , might perhaps produce an observable mechanical effect . " 1 Twenty - seven years later ...
Страница 51
... obtained by multiplying 136 by the ratios . The fourth line gives the deflections actually observed . Discs Calculated ratios . • • BB BS SIS SIB Calculated deflections Observed deflections · • 1'05 1.62 I'95 I'92 14'3 22'0 26.5 26.1 ...
... obtained by multiplying 136 by the ratios . The fourth line gives the deflections actually observed . Discs Calculated ratios . • • BB BS SIS SIB Calculated deflections Observed deflections · • 1'05 1.62 I'95 I'92 14'3 22'0 26.5 26.1 ...
Страница 55
... obtain consistent results this form of appara- tus requires very accurate construction and adjust- ment . For if the black disc is not accurately vertical , if the normal through its centre does not pass exactly through the axis of ...
... obtain consistent results this form of appara- tus requires very accurate construction and adjust- ment . For if the black disc is not accurately vertical , if the normal through its centre does not pass exactly through the axis of ...
Страница 57
... obtained . At first the experiment was tried with air at low pressure in the case . Then hydrogen was used instead , and the results obtained were much more consistent . The following table gives the observed torque in a series of ...
... obtained . At first the experiment was tried with air at low pressure in the case . Then hydrogen was used instead , and the results obtained were much more consistent . The following table gives the observed torque in a series 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.