Spectrum Analysis: Six Lectures, Delivered in 1868, Before the Society of Apothecaries of LondonMacmillan and Company, 1873 - 484 Seiten |
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Seite xiv
... Lines . APPENDIX A. - Spectrum Reactions of the Rubidium and Cæsium PAGE 100 Compounds . 128 APPENDIX B ... Double Spectra . - Angström's Conclusions.- Spec- trum of the Bessemer Flame . Selective Absorption . - Blood Bands ...
... Lines . APPENDIX A. - Spectrum Reactions of the Rubidium and Cæsium PAGE 100 Compounds . 128 APPENDIX B ... Double Spectra . - Angström's Conclusions.- Spec- trum of the Bessemer Flame . Selective Absorption . - Blood Bands ...
Seite xv
... Lines of certain Spectra 316 LECTURE VI . Planet and Moon Light . - Stellar Chemistry . - Huggins and Miller.— Spectra of the Fixed Stars . - Difficulties of Observation . Methods employed . — Variable Stars.- Double Stars .-- Temporary ...
... Lines of certain Spectra 316 LECTURE VI . Planet and Moon Light . - Stellar Chemistry . - Huggins and Miller.— Spectra of the Fixed Stars . - Difficulties of Observation . Methods employed . — Variable Stars.- Double Stars .-- Temporary ...
Seite 11
... line H in the violet the length of the wave is 1000th part of an inch , and the number of vibrations is 727 millions ... twice as great as it is at the other , and we are correct in stating that we can hear about 11 octaves , but that we ...
... line H in the violet the length of the wave is 1000th part of an inch , and the number of vibrations is 727 millions ... twice as great as it is at the other , and we are correct in stating that we can hear about 11 octaves , but that we ...
Seite 63
... double yellow line together with a faint continuous spectrum ; in other words , this light is monochromatic , or nearly so : almost all the light which glowing sodium vapour gives off is light of one degree of refrangibility , and the ...
... double yellow line together with a faint continuous spectrum ; in other words , this light is monochromatic , or nearly so : almost all the light which glowing sodium vapour gives off is light of one degree of refrangibility , and the ...
Seite 72
... line is in reality double when examined with a perfect optical arrangement , and that these lines are very fine , placed close together , and as thin as the finest spider's web . It is only because the arrangements I have to employ here ...
... line is in reality double when examined with a perfect optical arrangement , and that these lines are very fine , placed close together , and as thin as the finest spider's web . It is only because the arrangements I have to employ here ...
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absorption acid Ångström appear APPENDIX bands barium Bessemer flame blue bodies bright bands bright lines Bunsen cæsium calcium carbon chemical action Chemical Elements chloride chromosphere coincident colour comet compounds contains continuous spectrum dark lines detected didymium electric spark electrodes emitted examined experiments eyepiece Fourth Series Fraunhofer's gaseous gases give glass green lines heated Huggins hydrochloric acid hydrogen hydrogen line incandescent intensity iron Kirchhoff lecture light lithium Lockyer luminous magnesium maps metal lines millimetre motion nebula nitrogen observed obtained oxide oxygen pass peculiar Phil placed plate platinum Plücker portion position potassium present prism Proc produced quantity rays reaction refracted refrangible rubidium salts scale seen Sirius slit sodium sodium line solar atmosphere solar lines solar spectrum spectra spectroscope spectrum analysis stars strontium substance sun's telescope temperature thallium tube vapour velocity violet visible volatile wave-length whilst wire Wüllner yellow
Beliebte Passagen
Seite 41 - For the rays, to speak properly, are not coloured. In them there is nothing else than a certain power and disposition to stir up a sensation of this or that colour. For as sound in a bell or musical string, or other sounding body, is nothing but a trembling motion, and in the air nothing but that motion propagated from the object, and in the sensorium 'tis a sense of that motion under the form of a sound ; so colours in the object are nothing but a disposition to reflect this or that sort of rays...
Seite 300 - Here one is reminded by the fleecy, infinitely delicate cloud-forms, of an English hedge-row with luxuriant elms ; here of a densely intertwined tropical forest, the intimately interwoven branches threading in all directions, the prominences generally expanding as they mount upwards, and changing slowly, indeed almost imperceptibly. By this method the smallest details of the prominences, and of the chromosphere itself, are rendered perfectly visible and easy of observation.
Seite 374 - ... something of the motions of the stars relatively to our system. If the stars were moving towards or from the earth, their motion, compounded with the earth's motion, would alter to an observer on the earth the refrangibility of the light emitted by them, and consequently the lines of terrestrial substances would no longer coincide in position in the spectrum with the dark lines produced by the absorption of the vapours of the same substances existing in the stars.
Seite 242 - ... 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 degree of certainty as we can attain in any question of natural science.
Seite 219 - A, which can be removed at pleasure. Below the prism is an achromatic eye-piece, having an adjustable slit between the two lenses ; the upper lens being furnished with a screw motion to focus the slit. A side slit, capable of adjustment, admits, when required, a second beam of light from any object whose spectrum it is desired to compare with that of the object placed on the stage of the Microscope. This second beam of light strikes against a very small prism suitably placed inside the apparatus,...
Seite 41 - The homogeneal light and rays which appear red, or rather make objects appear so, I call rubrific or red-making; those which make objects appear yellow, green, blue, and violet, I call yellowmaking, green-making, blue-making, violet-making, and so of the rest.
Seite 414 - Pliicker states that when an induction spark of great heating power is employed, the lines expand so as to unite and form an undivided band. Even when the duplicity exists, the eye ceases to have the power to distinguish the component lines, if the intensity of the light be greatly diminished.
Seite 429 - Vega, a Cygni, show a motion of approach. There are in the stars already observed exceptions to this general statement ; and there are some other considerations which appear to show that the sun's motion in space is not the only, or even in all cases, as it may .be found, the chief cause of the observed proper motions of the stars*.
Seite 36 - ... rule exactly in such a posture that the refractions of the rays at their emergence out of the prism might be equal to that at their incidence on it. This prism had some veins running along within the glass from one end to the other, which scattered some of the sun's light irregularly, but had no sensible effect in increasing the length of the coloured spectrum. For I tried the same experiment with other prisms with the same success ; and particularly with a prism which seemed free from such veins,...
Seite 172 - ... can be most accurately noted. The light which is given off by the flame in this process is most intense ; indeed, a more magnificent example of combustion in oxygen cannot be imagined— and a cursory examination of the flame spectrum in its various phases reveals complicated masses of dark absorption bands and bright lines, showing that a variety of substances are present in the flame in the state of incandescent gas.