The Stars: A Study of the Universe |
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Page 58
... dark lines . This shows that in the spectrum of the sun light of certain definite wave- lengths is wholly or partly wanting . This fact has been observed for more than a century , but its true significance was not seen until a ...
... dark lines . This shows that in the spectrum of the sun light of certain definite wave- lengths is wholly or partly wanting . This fact has been observed for more than a century , but its true significance was not seen until a ...
Page 59
... dark lines with that of the bright lines produced by different gases when they are made incandescent . Hence arose the possibility of spectrum analysis , a method which has been applied with such success to the study of the heavenly ...
... dark lines with that of the bright lines produced by different gases when they are made incandescent . Hence arose the possibility of spectrum analysis , a method which has been applied with such success to the study of the heavenly ...
Page 60
... lines . It will give such a spectrum only when it is transparent through and through.1 A gaseous mass , so large as to be opaque , would , if it were of the same temperature inside and out , give a continuous spectrum , without any dark ...
... lines . It will give such a spectrum only when it is transparent through and through.1 A gaseous mass , so large as to be opaque , would , if it were of the same temperature inside and out , give a continuous spectrum , without any dark ...
Page 62
... its limit the air becomes opaque to radiation . A layer of one millimetre in thickness was found to absorb all the radiance shorter than 1700 . The strongest dark lines of the spectra were studied by 62 THE SPECTRA OF THE STARS.
... its limit the air becomes opaque to radiation . A layer of one millimetre in thickness was found to absorb all the radiance shorter than 1700 . The strongest dark lines of the spectra were studied by 62 THE SPECTRA OF THE STARS.
Page 63
A Study of the Universe Simon Newcomb. The strongest dark lines of the spectra were studied by Wollaston in 1802. Later Fraunhofer designated the strongest by the capital letters A , B , C , D , E , and F , to which some small letters ...
A Study of the Universe Simon Newcomb. The strongest dark lines of the spectra were studied by Wollaston in 1802. Later Fraunhofer designated the strongest by the capital letters A , B , C , D , E , and F , to which some small letters ...
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Common terms and phrases
actual Algol apical motion appear Aquila astronomers average Beta Lyræ binary systems body bright lines brighter stars brightest brilliancy catalogue celestial sphere centre century chapter cluster colour components conclusion constellation dark lines density determined direction distance double stars earth eclipses emitted equal Eta Aquila fact faint fainter follows galaxy greater Harvard Observatory heavens Herschel hydrogen hydrogen lines increase Kapteyn latter less Lick Observatory limit lucid stars mass measured Milky naked eye nearly nebula number of stars observations Observatory orbit Orion parallactic motion parallax period photographic Pickering planet pole position proper motion question R. A. Dec radial motion ratio remarkable revolving round right ascension seems seen Sirius sixth magnitude solar apex space spectra spectroscope spectroscopic binary spectrum square degrees star-density stellar supposed surface telescope temperature tion tude UNIVERS universe variable stars variation velocity visible wave-length zone
Popular passages
Page 284 - How charming is divine Philosophy! Not harsh and crabbed, as dull fools suppose, But musical as is Apollo's lute, And a perpetual feast of nectared sweets, Where no crude surfeit reigns.
Page 224 - Tis ours to trace him only in our own. He, who through vast immensity can pierce, See worlds on worlds compose one universe, Observe how system into system runs, What other planets circle other suns, What varied being peoples every star, May tell why Heaven has made us as we are.
Page 333 - The book is cleverly written and is one of the best works of its kind ever put before the public. It will be interesting to all readers, and especially to those interested in the study of science.
Page 26 - Now came still evening on, and twilight grey Had in her sober livery all things clad; Silence accompanied; for beast and bird, They to their grassy couch, these to their nests Were slunk, all but the wakeful nightingale ; She all night long her amorous descant sung , Silence was...
Page 121 - It may be glorious to write Thoughts that shall glad the two or three High souls, like those far stars that come in sight Once in a century ; — But better far it is to speak One simple word, which now and then Shall waken their free nature in the weak And friendless sons of men...
Page 262 - To God's eternal house direct the way A broad and ample road, whose dust is gold, And pavement stars...