Handbuch der Spectroscopie, Volum 1

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Pàgina 22 - 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 the prismatic spectrum of a flame may show it to contain substances which it would otherwise require a laborious chemical analysis to detect.
Pàgina 93 - 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...
Pàgina 22 - 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.
Pàgina 9 - 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...
Pàgina 21 - 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.
Pàgina 84 - Die Intensität der Strahlen von gewisser Wellenlänge, welche verschiedene Körper bei derselben Temperatur ausschicken, kann aber eine sehr verschiedene seyn; sie ist proportional mit dem Absorptionsvermögen der Körper für Strahlen der in Rede stehenden "Wellenlänge. Bei derselben Temperatur glüht deshalb Metall lebhafter als Glas, und dieses mehr als ein Gas. Ein Körper, der bei den höchsten Temperaturen ganz durchsichtig bliebe, würde niemals...
Pàgina 60 - When the peach-coloured nucleus of the cyanogen flame is properly examined, it yields a series of dark lines and spaces exceeding in number and strength those of the sunlight itself. These fixed lines are the representatives of dark shells, superposed among the shining ones with definite periodicity. In such a cyanogen flame they bear no relation to the burning of the carbon, but to the disengagement of the nitrogen they must be attributed.
Pàgina 81 - 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.
Pàgina 93 - ... of refrangibility of the double line D. Hence the presence of sodium in a source of light must tend to originate light of that quality. On the other hand, vapour of sodium in an atmosphere round a source, must have a great tendency to retain in itself, ie, to absorb and to have its temperature...
Pàgina 87 - 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.

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