Abstract
From a detailed investigation of reflecting spectra of cathode rays of 14-01 kilovolts from bent melybdenite, the inner potential, the refractive indiees for cathode rays and the parameter specifying the atomic arrangement in the crystal were determined. The inner potential is found to be 16-5 volts independent of electcon velocity. The internal in which the parameter lies was more accurately determined than that already obtained by the X-ray method. It was found that by the ordinary transmission method N-patterns of molyh-denite can be obtained and he used for the calibration of the wave-length of cathode rays