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165 Introduction.-.-- 165 Description of method_-.-166 Apparatus.  169 Sample preparation equipment-_-_-___-_169 Spectrographic equipment- 170 Standard samples and reference spectra_--____-___----_171 Procedure. 174 Preparation of sample 174 Electrode system.. 175 Excitation.. 176 Exposure conditions. 176 Photographic processing  177 Emulsion calibration 177 Photometry 178 Interferences..-.-- 179 Precision and accuracy-_---_----_--_ 180 Conclusion___  181 References cited. 181

Method for the quantitative spectrochemical analysis of rocks, minerals, ores, and other materials by a powder d-c arc technique