Spectrum analysis, 6 lects |
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Page xv
... employed . Variable Stars.- Double Stars .-- Temporary Bright Stars .-- Nebula . -Comets . --Motion of the Stars ( Huggins ) .- Determinations of Velocity of Solar Storms ( Lockyer ) . APPENDIX A. - Extract from a Memoir " On the ...
... employed . Variable Stars.- Double Stars .-- Temporary Bright Stars .-- Nebula . -Comets . --Motion of the Stars ( Huggins ) .- Determinations of Velocity of Solar Storms ( Lockyer ) . APPENDIX A. - Extract from a Memoir " On the ...
Page 27
... immense number of lines which intersect and almost appear to make the solar spectrum dark . Fraunhofer 1 1 Denkschriften der Münchener Akademie , 1814 . A a B C employed the letters of the alphabet LECT . I. ] 27 FRAUNHOFER'S LINES .
... immense number of lines which intersect and almost appear to make the solar spectrum dark . Fraunhofer 1 1 Denkschriften der Münchener Akademie , 1814 . A a B C employed the letters of the alphabet LECT . I. ] 27 FRAUNHOFER'S LINES .
Page 28
sir Henry Enfield Roscoe. A a B C employed the letters of the alphabet to designate some ( 6 E b uneh mb թսա ) 1 27 обтрир Fraunhofer's Abh . Denkschr . 1814_15 . FIG . 15 . of the principal lines , beginning with a in the red and ...
sir Henry Enfield Roscoe. A a B C employed the letters of the alphabet to designate some ( 6 E b uneh mb թսա ) 1 27 обтрир Fraunhofer's Abh . Denkschr . 1814_15 . FIG . 15 . of the principal lines , beginning with a in the red and ...
Page 43
... Professor Faraday . 2 Bunsen and Roscoe , Phil . Trans . 1859 . the following experiments we have employed prisms and lenses of APPEND . C. ] 43 CHEMICALLY ACTIVE RAYS . -On the Chemical Action of the constituent parts of Solar Light •
... Professor Faraday . 2 Bunsen and Roscoe , Phil . Trans . 1859 . the following experiments we have employed prisms and lenses of APPEND . C. ] 43 CHEMICALLY ACTIVE RAYS . -On the Chemical Action of the constituent parts of Solar Light •
Page 44
... employed thus exactly determined . In order to recognize with accuracy the various portions of the spectrum , we employed a map of the dark lines prepared by Mr. Stokes , which he most kindly placed at our disposal . The figure ( Fig ...
... employed thus exactly determined . In order to recognize with accuracy the various portions of the spectrum , we employed a map of the dark lines prepared by Mr. Stokes , which he most kindly placed at our disposal . The figure ( Fig ...
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Common terms and phrases
absorption acid Ångström apparatus appear APPENDIX bands barium Bessemer blue bodies bright bands bright lines Bunsen cæsium calcium carbon chemically active chloride chromosphere coincident colour comet compound contains continuous spectrum corona dark lines detected didymium double line earth electric spark emitted examined experiments Fe Fe flame Fourth Series Fraunhofer Fraunhofer's gaseous gases give glass green heat Huggins hydrochloric acid hydrogen lines incandescent intensity Kirchhoff Lecture light lithium Lockyer luminous magnesium maps miles per second millimetre motion nebula nitrogen object-glass observed obtained oxide oxygen Phil placed plate platinum portion position potassium present prism Proc produced prominences proper motion quantity rays refracting refrangible rubidium salts seen Sirius slit sodium sodium line solar atmosphere solar lines Solar Prominences solar spectrum spectra spectroscope spectrum analysis stars strontium substance sun's telescope temperature thallium tube vapour velocity violet visible wave-length whilst wire yellow
Popular passages
Page 102 - 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...
Page 41 - ... 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 more copiously than the rest...
Page 261 - The solar and atmospheric spectra being hidden, and the image of the wide slit alone being visible, the telescope or slit is moved slowly, and the strange shadow-forms flit past. Here one is reminded by the fleecy, infinitely delicate...
Page 300 - Here one is reminded, by the fleecy, infinitely delicate cloud-films, of an English hedgerow 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.
Page 219 - 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, and is reflected up through the compound...
Page 242 - ... 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.
Page 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.
Page 37 - Now the different Magnitude of the hole in the Window-shut, and different thickness of the Prism where the Rays passed through it, and different inclinations of the Prism to the Horizon, made no sensible changes in the length of the Image. Neither did the different matter of the Prisms make any : for in a Vessel made of polished Plates of Glass cemented together in the shape of a Prism and filled with Water, there is the like Success of the Experiment according to the quantity of the Refraction.
Page 427 - 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*.
Page 42 - Another interesting practical application of our knowledge concerning the properties of the kind of light which certain bodies emit when heated, is the employment of the light evolved by burning Magnesium wire for photographic purposes. The spectrum of this light is exceedingly rich in violet and ultra-violet rays, due partly to the incandescent vapour of magnesium, and partly to the intensely-heated magnesia formed by the combustion. Professor Bunsen and the speaker in 1859 determined the chemically...