Studies in spectrum analysisD. Appleton and Company, 1878 - 258 páginas |
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Términos y frases comunes
absorption alloy aluminium Ångström atmosphere atomic weight bands barium bodies bright lines Bromide Bunsen Bunsen burner cadmium calcium chemical chloride chromosphere cobalt coincident coloured complete compound molecule continuous spectrum density dissociation electric lamp electrodes elements employed ether experiments fact flame fluoride Fraunhofer lines free path gases give glass heat heliostat hydrogen incandescent increase iodide iron Kirchhoff lens light source line spectrum liquids long and short longest lines magnesium matter means metalloids method millimetre molecular molecules motion observed obtained oxide oxyhydrogen flame particles pass phenomena photograph plate platinum wire poles portion pressure prism produced Prof rays red end refrangible rendered result reversed salts seen short lines silver slit sodium sodium vapour solar spectrum solid sound spark spec spectra spectroscope Stokes Strontic strontium substances temperature thickness things tion tium trum tube vibrations violet visible volatile wave length white light yellow
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Página 231 - Friswell was requested to prepare two lists, showing broadly the chief chemical characteristics of the elements traced and not traced in the sun. The Tables showed that, in the main, those metals which had been traced formed stable compounds with oxygen.
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Página 225 - ... great accuracy. In addition to this, the circumstance that these lines occur in groups renders the observation of the coincidence of these spectra more exact than is the case with those composed of single lines. The lines produced by chromium, also, form a very characteristic group, which likewise coincides with a remarkable group of Fraunhofer's lines ; hence I believe that I am justified in affirming the presence of chromium in the solar atmosphere.