Researches on the solar spectrum, and the spectra of the chemical elements, tr. by H.E. Roscoe, Band 2,Teil 1 |
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Seite 5
... whilst the difference in breadth of the lines is expressed by the letters a , b , c , d , e , f , g , a signifying the smallest , and g the greatest breadth . ON THE SPECTRA OF THE CHEMICAL ELEMENTS . The colours ON THE SOLAR SPECTRUM . 5.
... whilst the difference in breadth of the lines is expressed by the letters a , b , c , d , e , f , g , a signifying the smallest , and g the greatest breadth . ON THE SPECTRA OF THE CHEMICAL ELEMENTS . The colours ON THE SOLAR SPECTRUM . 5.
Seite 8
... whilst direct sunlight can enter the lower half of the slit , the rays from an artificial source of light placed at one side can reach the large prisms after twice suffering total reflection . The small prisms were placed upon each ...
... whilst direct sunlight can enter the lower half of the slit , the rays from an artificial source of light placed at one side can reach the large prisms after twice suffering total reflection . The small prisms were placed upon each ...
Seite 14
... whilst it is perfectly transparent for all other rays . This supposition is rendered probable by the fact , which has long been known , that certain gases , as for instance , nitrous acid and iodine vapour , possess at low temperatures ...
... whilst it is perfectly transparent for all other rays . This supposition is rendered probable by the fact , which has long been known , that certain gases , as for instance , nitrous acid and iodine vapour , possess at low temperatures ...
Seite 16
... whilst the direct solar rays fell on the instrument ' . These facts would appear to justify the supposition that each incan- descent gas diminishes by absorption the intensity of those rays only which possess degrees of refrangibility ...
... whilst the direct solar rays fell on the instrument ' . These facts would appear to justify the supposition that each incan- descent gas diminishes by absorption the intensity of those rays only which possess degrees of refrangibility ...
Seite 24
Gustav Robert Kirchhoff. greatly , owing mainly to difference in their masses . Thus whilst the moon has become cooler than the Earth , the temperature of the surface of the Sun has not yet sunk below a white heat . Our terrestrial at ...
Gustav Robert Kirchhoff. greatly , owing mainly to difference in their masses . Thus whilst the moon has become cooler than the Earth , the temperature of the surface of the Sun has not yet sunk below a white heat . Our terrestrial at ...
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Häufige Begriffe und Wortgruppen
5b Fe 5c Fe absorption according altered angle appear Arago's bands become bodies breadth bright lines brought Bunsen's caused centre CHEMICAL cloud coincidence coloured consider considerable consisting constitution containing currents dark lines determine direction disc distance distinct drawing Earth edge electric spark electrodes elements emitted employed examination existence experiment explained fact flame formed give given glass greater groups half heat incandescent increase intensity iron iron lines layer less light lines appear liquid lower luminous mass means metals method middle motion noticed nucleus object-glass observed obtained occur owing pass phenomena placed plate portion position possess present prisms probability produced Professor question rays remarkable rendered represented reversed salt scale seen similar slit sodium lines solar atmosphere solar spectrum solid spectra sun's suppose supposition surface telescope temperature theorem theory tube vapour various visible whilst wire
Beliebte Passagen
Seite 12 - ... one line being less bright, although broader, than a second, is less visible when the mass of incandescent gas is small, but becomes more distinctly seen than the second line when the thickness of the vapour is increased. Indeed, if the luminosity of the whole...
Seite 20 - Fraunhofer's lines explained, it seemed reasonable to suppose that other terrestrial bodies occur there, and that, by exerting their absorptive power, they may cause the production of other Fraunhofer's lines. For it is very probable that elementary bodies which occur in large quantities on the earth, and are likewise distinguished by special bright lines in their spectra, will, like iron, be visible in the solar atmosphere. This is found to be the case with calcium, magnesium, and sodium.
Seite 11 - It seems to me to be a question of great interest to determine, whether these and other similar coincidences are real or only apparent ; whether the lines in question actually fall one upon the other, or whether they lie very close together. I believe that my method of observation does not possess the requisite accuracy for the purpose of answering this question with any degree of probability, and I think that a large number of prisms and an increased intensity of light will prove necessary.
Seite 14 - ... through a suitable flame coloured by common salt, dark lines were seen in the spectrum in the position of the sodium lines. " The same phenomenon was observed if, instead of the incandescent lime, a platinum wire was used, which being heated in a flame was brought to a temperature near its melting point by passing an electric current through it.
Seite 13 - I obtained a tolerably bright solar spectrum, and brought a flame coloured by sodium vapour in front of the slit. I then saw the dark lines D change into bright ones. The flame of a Bunsen's lamp threw the bright sodium lines upon the solar spectrum with unexpected brilliancy. In order to find out the extent to which the intensity of. the solar spectrum could be increased without impairing the distinctness of the sodium lines, I allowed the full sunlight to shine through the sodium flame, and to...
Seite 20 - ... great accuracy. In addition to this, the circumstance that these lines occur in groups, renders the observation of the coincidence of these spectra more exact than is the case with those composed of single lines. The lines produced by chromium also form a very characteristic group, which likewise...
Seite 19 - ... be produced by some cause, and a cause can be assigned which affords a perfect explanation of the phenomenon. The observed phenomenon may be explained by the supposition that the rays of light which form the solar spectrum have passed through the vapour of iron, and have thus suffered the absorption which the vapour of iron must exert.
Seite 19 - ... which we see in the solar spectrum ; and this supposition is rendered still less probable by the fact that these lines do not appreciably alter when the sun approaches the horizon. It does not, on the other hand, seem at all unlikely, owing to the high temperature which we must suppose the sun's atmosphere to possess, that such vapours should be present in it. Hence the observations of the solar spectrum appear to me to prove the presence of iron vapour in the solar atmosphere with as great a...
Seite 23 - ... which can be made respecting the sun's constitution is, that it consists of a solid or liquid nucleus, heated to a temperature of the brightest whiteness, surrounded by an atmosphere of somewhat lower temperature. This supposition is in accordance with Laplace's celebrated nebular theory respecting the formation of our planetary system. If the matter, now concentrated in the several heavenly bodies, existed in former times as an extended and continuous mass of...
Seite 19 - Hence this coincidence must be produced by some cause, and a cause can be assigned which affords a perfect explanation of the phenomenon.