Nature . lement had only one line spectrum Fic. 5.—The longs and shorts of sodium taken under the sameconditions, showing that the orange line extends furthest fromthe poles. was erroneous, and that the results obtained suggestedthat the various terrestrial and solar phenomena wereproduced by a series of simplifications brought aboutby each higher temperature employed. That is, thatthe new instrument, the spectroscope, showed that higher NO. 1536, VOL. 59] spectra extending far into the violet—stars thereforehotter than their fellows of a yellow or red colour—wehad to do with hydrogen almost a
Nature . lement had only one line spectrum Fic. 5.—The longs and shorts of sodium taken under the sameconditions, showing that the orange line extends furthest fromthe poles. was erroneous, and that the results obtained suggestedthat the various terrestrial and solar phenomena wereproduced by a series of simplifications brought aboutby each higher temperature employed. That is, thatthe new instrument, the spectroscope, showed that higher NO. 1536, VOL. 59] spectra extending far into the violet—stars thereforehotter than their fellows of a yellow or red colour—wehad to do with hydrogen almost alone. It was in 1873 that I first called the attention of theRoyal Society to the very remarkable facts which had eventhen been brought together regarding the possible actionof heat in the sun and stars. Referring more especiallyto the classification of stars by Rutherfurd, I wrote asfollows : 1 I have asked myself whether all the above facts can-not be grouped together in a working hypothesis which. Fig. 6.—Spectrum of a sun-spot as compared with the generalspectrum, showing that certain metallic lines (sodium andcalcium in this instance) are widened. The darker portionrepresents the spectrum of the spot. assumes that in the reversing layers of the sun and starsvarious degrees of celestial dissociation are at work,which dissociation prevents the coming together of theatoms which, at the temperature of the earth and at allartificial temperatures yet attained here, compose themetals, the metalloids, and compounds. Subsequently in a private letter to M. Dumas, who tookthe keenest interest in my solar work, I wrote, II sembleque plus une dtoile est chaude plus son spectre estsimple. 1 Phil. Trans.^ vol. clxiv. part 2, p. 49J. 538 jVA ture I also pointed out the close relation of hyrirojjen tocalcium, magnesium, and other metals (it was on this [Aiiai, 6, 1899 Academy of Sciences was thus concluded by : / .7 0^7 V ARC ANGSTROM SPARK THALEN 20 IFREQUENCIES 59 SUN SPO
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