Serious limitations are encountered in the analysis of insulators when conducting tubes packed with the powdered insulator are the electrodes of the vacuum spark. A general method of forming a vacuum spark directly between a conductor and a slab of insulator, which removes the above limitations, is presented. Mass spectral data of the insulators steatite and quartz are presented showing the presence of bulk impurities and surface contamination.
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A. J. Ahearn (1961) studied this question.
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