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accuracy Adam Hilger alloys aluminium amperes application arc and spark arc or spark arc spectrum atom blackening cadmium carbon cent Chapter Chemical Analysis condenser constant constituents copper copper electrodes D. M. Smith detection determination developed electrodes element present emission spectra emitted employed examination excitation exposure flame spectra Gerlach germanium given Gramont graphite graphite electrodes Hartmann Hilger laboratory Hitchen Ilford impurities increase Inst instrument ionised Judd Lewis light source logarithmic sector magnesium measured metallurgical metals method microphotometer minerals obtained orbit Pentlandite percentage photographic plate platinum pole post free precipitates procedure quantitative spectrum analysis quartz spectrograph R.U. Powder radiation reference relative intensities sample selenium self-inductance sensitive lines silver slit small quantities solutions spark discharge spark spectra specimen spectrographic analysis spectroscope spectrum analysis spectrum lines spelter standard substance suitable technique tube Twyman ultra-violet unknown line vacuum tube visible spectrum visual Wavelength Spectrometer Wavelength Tables whilst zinc