Handbuch der Spectroscopie, Volume 2

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S. Hirzel, 1902 - 8 pages
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Page 7 - We know that a stretched string which on being struck gives out a certain note (suppose its fundamental note) is capable of being thrown into the same state of vibration by aerial vibrations corresponding to the same note. Suppose now a portion of space to contain a great number of such stretched strings, forming thus the analogue of a "medium." It is evident that such a medium on being agitated would give out the note above mentioned, while on the other hand, if that note were sounded in air at...
Page 262 - The question is asked whether all the above facts cannot be grouped together in a working hypothesis, which assumes that in the reversing layers of the sun and stars various degrees of
Page 179 - ... there is no good reason for assuming that the energy which takes the form of radiation in the electric discharge through a gas must first take the form of the motion of translation of the particles on which temperature depends. The gas may, for a short time, be intensely luminous at a very low temperature ; and if the impulses which give rise to the vibratory movements of the particles be of different characters, the characters of the vibrations also may differ within certain limits. Leaving,...
Page 9 - B with the same intensity as it had at A. But the quality of the ray at B will also be the same as its quality at A. For, if it were different, then either a greater or less proportion would be absorbed in its passage from B to C, than was absorbed of the equally intense ray at A, in its passage between A and B. The amount of heat absorbed by the particles between B and C would therefore be different from that absorbed by the particles between A and B. But this cannot be ; for, on the hypothesis...
Page 26 - Wenn ein Raum von Körpern gleicher Temperatur umschlossen ist, und durch diese Körper keine Strahlen hindurchdringen können, so ist ein jedes Strahlenbündel im Innern des Raumes seiner Qualität und Intensität nach gerade so beschaffen, als ob es von einem vollkommen schwarzen Körper derselben Temperatur herkäme, ist also unabhängig von der Beschaffenheit und Gestalt der Körper und nur durch die Temperatur bedingt.
Page 43 - I conclude, that, as the temperature of an incandescent body rises, it emits rays of light of an increasing refrangibility; and that the apparent departure from this law, discovered by an accurate prismatic analysis, is due to the special action of the eye in performing the function of vision.
Page 90 - Roth an sich zu zeigen; steigt die Temperatur höher und höher, so kommen Strahlen von kleinerer und kleinerer "Wellenlänge hinzu, in der Art, dass bei jeder...
Page 149 - ... according as one gas or the other is in excess, but the excess of oxygen is favourable to the formation and stability of the oxide, while excess of hydrogen facilitates the reduction of magnesium and its maintenance in the metallic state. As regards temperature, it should be observed that while substances merely heated by the flame, and not undergoing chemical change, are not likely to rise to a temperature above the average temperature of the flame, it will be otherwise with the materials of...
Page 12 - That the flow of heat from the interior upon the surface of a substance of indefinite thickness, is proportional caeteris paribus to its index of refraction and that for every description of heat.
Page 26 - Schwierigkeiten im Wege; trotzdem scheint die Hoffnung gegründet, sie durch Versuche ermitteln zu können, da sie unzweifelhaft von einfacher Form ist, wie alle Functionen es sind, die nicht von den Eigenschaften einzelner Körper abhängen, und die man bisher kennen gelernt hat. Erst wenn diese Aufgabe gelöst ist, wird die ganze Fruchtbarkeit des bewiesenen Satzes sich zeigen können; aber auch jetzt schon lassen sich wichtige Schlüsse aus demselben ziehen.

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