The Pressure of LightSociety for Promoting Christian Knowledge, 1910 - 103 страници |
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Страница 13
... side , and when a lighted match or candle is brought near the bulb , the blackened faces retreat from the source of light while the unblackened faces move towards it . At first it was supposed that the action might be directly due to ...
... side , and when a lighted match or candle is brought near the bulb , the blackened faces retreat from the source of light while the unblackened faces move towards it . At first it was supposed that the action might be directly due to ...
Страница 14
... side go back with the same velocity with which they came up and do not give an increased kick back . Thus the residual air presses more against the black surface and the vanes spin round . For reasons which we cannot enter into here ...
... side go back with the same velocity with which they came up and do not give an increased kick back . Thus the residual air presses more against the black surface and the vanes spin round . For reasons which we cannot enter into here ...
Страница 17
... side- ways . It is this side pressure of the tubes against each other or against any body on which they impinge sideways which is their essential property for our present purpose . We may symbolize magnetic attraction in a similar way ...
... side- ways . It is this side pressure of the tubes against each other or against any body on which they impinge sideways which is their essential property for our present purpose . We may symbolize magnetic attraction in a similar way ...
Страница 18
... side pressure of the 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 ...
... side pressure of the 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 ...
Страница 35
... sides with a layer of platinum black , while those on the left hand were polished . The globe was exhausted as far as possible by means of a Sprengel pump , and then the beam from an arc lamp was directed on to one of the discs , and ...
... sides with a layer of platinum black , while those on the left hand were polished . The globe was exhausted as far as possible by means of a Sprengel pump , and then the beam from an arc lamp was directed on to one of the discs , and ...
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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.