Since the procurement of oscillator quartz became progressively worse during the war, and since the synthetic production of quartz did not seem to be proceeding sufficiently well, Professor Carl F. Correns pointed out the possibility that nepheline, which is known to possess piezoelectric properties but occurs in too small size in nature, might be obtained in sufficient purity and size from a melt. In addition, it seemed desirable to attempt to replace sodium by other ions in order to improve the piezo-electric qualities.

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