Handbuch der Spectroscopie, Volume 1

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S. Hirzel, 1900
 

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Page 20 - 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 the prismatic spectrum of a flame may show it to contain substances which it would otherwise require a laborious chemical analysis to detect.
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...
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 19 - It is also remarkable," he continues in the text, " that alcohol burnt in an open vessel, or in a lamp with a metallic wick, gives but little of the yellow light; while, if the wick be of cotton, it gives a considerable quantity, and that for an unlimited time. (I have found other instances of a change of colour in flames, owing to the mere presence of the substance, which suffers no diminution in consequence. Thus a particle of muriate of lime on the wick of a spirit-lamp will produce a quantity...
Page 7 - If a beam of daylight be admitted into a dark room by a crevice -fa of an inch broad, and received by the eye at the distance of 10 to 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, in the proportions represented in fig.
Page 58 - 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.
Page 80 - Sonnenspectrum und liess dabei die Sonnenstrahlen, bevor sie auf den Spalt fielen, durch eine kräftige Kochsalzflamme treten. War das Sonnenlicht hinreichend gedämpft, so erschienen an Stelle der beiden dunkeln Linien D zwei helle Linien; überstieg die Intensität jenes aber eine gewisse Grenze, so zeigten sich die beiden dunkeln Linien D in viel grösserer Deutlichkeit, als ohne die Anwesenheit der Kochsalzflamme. Das Spectrum des Drummond...
Page 91 - ... itself ie to absorb and to have its temperature raised by light from the source of the precise quality in question. In the atmosphere around the sun, therefore, there must be present vapour of sodium, which, according to the mechanical explanation thus suggested, being particularly opaque for light of that quality, prevents such of it as is emitted from the sun from penetrating to any considerable distance through the surrunding atmosphere. The test of this theory must be had in ascertaining...
Page 60 - L'étincelle électrique est produite par un courant qui se propage à travers et par la matière pondérable , et l'échauffé de la même manière et suivant les mêmes lois qu'un courant voltai'que échauffe et rend lumineux un fil métallique.
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.

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