The Pressure of LightSociety for Promoting Christian Knowledge, 1910 - 103 страници |
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Страница 34
... glass globe 20 cm . or 8 inches in . diameter , among other arrangements of discs , 1 Electricity and Magnetism , § 793 . 2 Rapports , vol . 2 , p . 133. A fuller account is given in Ann . du Physik , vi . 433 , Nov. 1901 . HH T H Ι Σ ...
... glass globe 20 cm . or 8 inches in . diameter , among other arrangements of discs , 1 Electricity and Magnetism , § 793 . 2 Rapports , vol . 2 , p . 133. A fuller account is given in Ann . du Physik , vi . 433 , Nov. 1901 . HH T H Ι Σ ...
Страница 35
... glass thread TH . was a glass rod to which was fixed a mirror M , which reflected a scale into a telescope to give the position of the arrangement . On cross arms were fixed discs of platinum foil each o'5 cm . in diameter , and each ...
... glass thread TH . was a glass rod to which was fixed a mirror M , which reflected a scale into a telescope to give the position of the arrangement . On cross arms were fixed discs of platinum foil each o'5 cm . in diameter , and each ...
Страница 39
... glasses , CD ( fig . 15 ) , each 12.8 mm . in diameter , and o'17 mm . thick , were hung up in a partially exhausted glass vessel by a quartz fibre . They were sil- vered on the front side and brilliantly polished . m was a small mirror ...
... glasses , CD ( fig . 15 ) , each 12.8 mm . in diameter , and o'17 mm . thick , were hung up in a partially exhausted glass vessel by a quartz fibre . They were sil- vered on the front side and brilliantly polished . m was a small mirror ...
Страница 40
... glass , would still be incident on the silver on the front . This would still therefore be the warmer face , and the radiometer action would be in the same direction as before . That is , it would now be opposed to and lessen the ...
... glass , would still be incident on the silver on the front . This would still therefore be the warmer face , and the radiometer action would be in the same direction as before . That is , it would now be opposed to and lessen the ...
Страница 41
... glass plates , fixed respectively in front and behind the disc , with a small interval between , as shown in fig . 16. The radiometer action was then eliminated . For if a molecule gave an extra kick back against the absorbing disc , it ...
... glass plates , fixed respectively in front and behind the disc , with a small interval between , as shown in fig . 16. The radiometer action was then eliminated . For if a molecule gave an extra kick back against the absorbing disc , it ...
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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.