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absorption acid analysis apparatus appear Appendix atmosphere bands becomes blue bodies bright lines calcium carbon caused chemical chloride coincidence colour comet compounds consists contains continuous corresponding dark lines detected determined diagram direction distance distinct drawing effect electric elements emitted employed examination exhibits existence experiments fact flame give given green heated Huggins hydrogen important inch increase intensity interesting iron Kirchhoff lecture length less light lithium luminous matter means measures metals method motion nebula nitrogen notice observed obtained occur pass Phil placed PLATE portion position potassium present prism produced quantity rays reaction reference reflected refracting refrangible represented salts scale seen Series similar slit sodium solar spectrum spark spectra spectroscope stars strontium substance telescope temperature tube vapour visible wire yellow
Page 117 - the prismatic spectrum of a flame may show it to contain substances which it would otherwise require a laborious chemical analysis to detect." In a subsequent communication, 1 the same physicist, after a striking description of the spectra of lithium and strontium, continues : " Hence I hesitate not to say that optical analysis can distinguish the
Page 36 - the rays they are nothing but their dispositions to propagate this or that motion into the sensorium, and in the sensorium they are sensations of those motions under the forms of colours. APPENDIX B. BURNING MAGNESIUM WIRE, A
Page 55 - scale in Fig. 22, through which the rays from the coloured flames (e and e) fall upon the prism, being rendered parallel by passing through a lens. The light, having been refracted, is received by the telescope (/), and the image magnified before reaching the eye. The rays from each
Page 248 - will read to you Sir John Herschel's description of this nebula. "The general aspect of the less luminous and cirrous portion is simply nebulous and irresolvable ; but the brighter portion immediately adjacent to the trapezium forming the square front of the head is shown with the
Page 199 - of these metals correspond to distinct lines in the solar spectrum, but the weaker lines are not noticeable. The remaining metals which I have examined—viz. gold, silver, mercury, aluminium, cadmium, tin, lead, antimony, arsenic, strontium, and lithium —are according to my observation not visible in the solar atmosphere.
Page 69 - which was about 60 cubic metres, we burnt a mixture of three milligrammes of chlorate of sodium with milk-sugar, whilst the non-luminous colourless flame of the lamp was observed through the slit of the telescope. Within a few minutes the flame, which gradually become pale yellow, gave a distinct sodium line, which,
Page 308 - smoke of these jets, however, never seemed to be able to get far out towards the sun, but always to be driven back and forced into the tail, as if by the action of a violent wind setting against them (always from the sun), so to make it clear that the tail is neither more
Page 288 - seen in the spectra of these nebula? represent the whole of the light emitted by these bodies, or whether these lines are the strongest lines only of their spectra, which, by reason of their greater intensity, have succeeded in reaching the earth. Since these nebulae are bodies which have a sensible diameter, and in all
Page 82 - were observed. At first the bright yellow sodium line Naa, appeared with a background formed by a nearly continuous pale spectrum ; as soon as this line began to fade, the exactly defined bright red line of lithium, Lia, was seen; and still further removed from the sodium line the faint red potassium line, Ka