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accuracy Adam Hilger allg alloys aluminium anorg application arc and spark arc or spark arc spectrum barium cadmium caesium calcium Chapter Chem chemical analysis chromium cobalt condensing lens constant constituents copper D. M. Smith detection determination discharge doublet electrodes elements present energy estimation examination excitation flame spectra Gerlach germanium Gramont graphite Hilger Quartz Spectrograph Ibid impurities instrument internal standard investigation iron Judd Lewis laboratory light source lower electrode magnesium Metallurgical Analyses metals Mineralogy minerals o.1 per cent obtained orbit persistent lines photographed plate platinum pole post free Published by Adam pure Quantitative Spectrum Analysis quartz R.U. Powder raies ultimes recent rubidium Ruthenium sample Schweitzer self-induction sensitive lines silicate minerals silver slit small quantities sodium solution spark spectra specimen spectrographic analysis spectrometer Spectrum Analysis spelter substance Tables for Spectrum thorium tube tungsten ultra-violet unknown line vacuum tube vanadium visual wavelength Wavelength Tables wire Zeits zinc