Handbuch der Spectroscopie, Volume 1

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S. Hirzel, 1900 - 8 pages
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Page 91 - D of the solar spectrum with the double bright line constituting the spectrum of the spirit-lamp burning with salt. I remarked that there must be some physical connexion between two agencies presenting so marked a characteristic in common. He assented, and said he believed a mechanical explanation of the cause was to be had on some such principles as the following : — Vapour of sodium...
Page 58 - There is one of these special cases which deserves attentive consideration in connection with the appearance of the electric light ; it is the production of Fraunhoferian lines, when things have been arranged in such a way that an incombustible material is present in the substance to be burnt. This state is perfectly represented in the case of cyanogen, which contains more than half its weight of incombustible nitrogen. When the...
Page 91 - ... for light of that quality prevents such of it as is emitted from the sun from penetrating to any considerable distance through the surrounding atmosphere. The test of this theory must be had in ascertaining whether or not vapour of sodium has the special absorbing power anticipated. I have the impression that some Frenchman did make this out by experiment, but I can find no reference on the point.
Page 7 - If a beam of daylight be admitted into a dark room by a crevice ifa of an inch broad, and received by the eye at the distance of 10 or 12 feet, through a prism of flint glass, free from veins, held near the eye, the beam is seen to be separated into the four following colours only, red, yellowish green, blue, and violet...
Page 19 - This red ray appears to possess a definite refrangibility, and to be characteristic of the salts of potash, as the yellow ray is of the salts of soda, although, from its feeble illuminating power, it is only to be detected with a prism. If this should be admitted, I would further suggest, that whenever the prism shows a homogeneous ray of any colour to exist in a flame, this ray indicates the formation or the presence of a definite chemical compound.
Page 19 - The other lines may be attributed to the antimony, strontia, &c. which enter into this composition. For instance, the orange ray may be the effect of the strontia, since Mr. Herschel found in the flame of muriate of strontia a ray of that colour. If this opinion should be correct, and applicable to the other definite rays, a glance at 1 Brewster's Journal of Science, vol.
Page 79 - 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 20 - The strontia flame exhibits a great number of red rays well separated from each other by dark intervals, not to mention an orange and a very definite bright blue ray. The lithia exhibits one single red ray. Hence I hesitate not to say that optical analysis can distinguish the minutest portions of these two substances from each other with as much certainty, if not more, than any other known method.
Page 85 - Bei dieser umfassenden und zeitraubenden Untersuchung, deren Einzelheiten wir übergehen zu dürfen glauben, hat sich herausgestellt, dass die Verschiedenheit der Verbindungen, in denen die Metalle angewandt wurden, die Mannigfaltigkeit der chemischen Processe in den einzelnen Flammen und der ungeheure Temperaturunterschied dieser letzteren keinen Einßuss auf die Lage der den einzelnen Metallen entsprechenden Spectrallinien ausübt.
Page 14 - The colours thus communicated by the different bases to flame afford, in many cases, a ready and neat way of detecting extremely minute quantities of them...

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